During summer, tree leaves are green. This is because a green pigment inside the leaves uses sunlight to make food. When autumn comes and temperatures fall, this green pigment breaks down, and hidden yellows and reds appear. In this way the leaves turn their autumn colors. What is the main idea of the passage?

Correct: C) Leaves turn their autumn colors because the green pigment breaks down.

The passage explains that a green pigment makes food and that in autumn it breaks down, revealing yellows and reds — the mechanism of autumn color. So C. A contradicts the text, and B and D are not stated.

Penguins are birds, but they cannot fly through the air. Instead, they use their wings like flippers to swim swiftly through the water. A thick layer of fat helps keep their body warm even in cold seas. On land they waddle, but in the water they are strikingly nimble. According to the passage, how do penguins use their wings?

Correct: B) Like flippers, to swim through the water.

The passage states plainly that penguins 'use their wings like flippers to swim swiftly through the water.' So B. They cannot fly (A); fat keeps them warm (C); and D is not stated.

Stepping into the kitchen, a sweet, toasty smell hung in the air. Through the oven door, a risen dough could be seen turning golden brown. On the table sat a bag of flour and several eggshells. The clock pointed to exactly three o'clock. What can most strongly be inferred from this scene?

Correct: D) Someone is baking sweets or bread.

The sweet toasty smell, the risen dough browning in the oven, and the flour and eggshells strongly point to baking sweets or bread (D). Soup (A) conflicts with this, and B and C have no basis in the text.

When you come home from being out, wash your hands first. Your hands may carry invisible dirt and germs. Lather the soap well and spend about twenty seconds washing between your fingers and around your nails, and the dirt comes off more easily. Habits like this help prevent colds and the like. What is the author's main purpose?

Correct: A) To encourage the reader to wash their hands correctly.

The passage urges handwashing, advises on lathering and timing, and says it helps prevention. The purpose is to encourage proper handwashing (A). Soap scents (B), the history of colds (C), and water bills (D) are not in the text.

Long ago, people spent days carrying letters to reach someone far away. In time the telephone was born, letting them speak by voice at once. Today we can send messages and video anywhere in the world in an instant. The means of communication have grown faster and easier with the ages. At the same time, so much information now flows that a new difficulty has arisen: choosing out the messages that truly matter. What is the passage most trying to say?

Correct: B) The means of communication became faster and easier, but a new difficulty of information overload arose.

The passage traces the progress from letters to phones to modern communication, showing both the benefit of speed and ease and the difficulty of information overload. So the main idea is B. A, C, and D are claims not in the text.

Plants make their own food using sunlight, water, and carbon dioxide. This process is called photosynthesis. The food made in the leaves travels through the stem to the roots and fruit, where it is used for growth and ripening. In the process, oxygen is released into the air as a by-product. Much of the oxygen we breathe is produced by plants in this way. According to the passage, what is released into the air during photosynthesis?

Correct: C) Oxygen

The passage states that 'oxygen is released into the air as a by-product.' So C. Carbon dioxide is used as an input (A), water is also an input (B), and food is what is transported (D); what is released is oxygen.

The library added a new 'quiet-talking allowed' section. Students doing group study, who used to be told to lower their voices, began gathering there. Then students who had come to read but said they could not settle down began saying, 'I can focus better than before.' Requests to use the section grow by the day. What can most reasonably be inferred from this passage?

Correct: A) Separating the talking area likely improved conditions for those who want to read quietly, too.

After group-study students moved to the talking section, readers said they 'can focus better than before,' and use is rising. Separating talkers from readers likely improved conditions for both (A). B, C, and D have no basis in the text.

If you get lost in the mountains, do not wander about at random. It wastes your strength and actually raises the danger of a serious accident. First, stop and think back over the way you came. If you cannot tell, stay where you are and signal your location with a whistle or a brightly colored cloth. It is also important to secure a spot sheltered from the wind before nightfall. What is the author's main purpose?

Correct: D) To instruct the reader on what to do when lost.

The passage gives a sequence of instructions: don't wander, stop, signal your location, secure shelter from the wind. Its purpose is to instruct on actions (D). It is not about scenery (A), a gear list (B), or statistics (C).

In many cities, rivers were once fouled with trash and wastewater, and the fish had vanished. As people built systems to clean the wastewater and kept up efforts to clear trash from the banks, the water gradually grew clear. In time the fish returned, and birds began to gather. At the same time, it became clear anew that such recovery takes long years and much human effort. What does the passage say as a whole?

Correct: C) Human efforts revived the river, but it took long time and labor.

The passage describes how human efforts — wastewater treatment and trash cleanup — revived the river, while also noting the recovery took long years and effort, presenting both sides. So the main idea is C. A contradicts the text's 'if left alone,' and B and D are claims not in the text.

There is a reason the sky looks blue. Sunlight is a mixture of many colors, but when it hits the tiny particles in the air, blue light scatters in all directions more strongly than the other colors. This scattered blue light spreads across the whole sky, so the daytime sky looks blue. In the evening, when the sun is low, the light passes through more air, the blue light scatters away entirely, and the remaining red light turns the sky red. According to the passage, why does the daytime sky look blue?

Correct: D) Because blue light scatters in all directions more strongly than other colors.

The passage says blue light 'scatters in all directions more strongly than the other colors,' spreading across the sky so it looks blue. So D. Air being blue (A), light being only blue (B), and sea reflection (C) are contrary to or absent from the text.

At one factory, the machines had grown old and would suddenly stop several times a month, holding up the work. When they made the bold move of replacing the old machines with new ones, sudden stoppages afterward all but disappeared. The amount they could produce steadied, and the need to work overtime to catch up dropped as well. What can most reasonably be concluded from this experience?

Correct: B) Replacing the aging machines likely helped reduce the sudden stoppages.

The old machines stopped often, and after replacement stoppages nearly vanished and production steadied, so the replacement likely helped reduce the stoppages (B). A contradicts this, C reverses the cause, and D has no basis in the text.

Press a child with 'Why haven't you done your homework?' and the child defends itself with excuses or silence, and the dialogue closes. In the same situation, saying 'Shall we look together at where you got stuck?' makes it easier for the child to explain. A single choice in how you frame the question greatly changes whether the other person opens up or shuts down. Why does the author give the example 'Why haven't you done your homework?'

Correct: C) To show that a pressing way of asking closes off dialogue.

The author presents this phrasing as a bad example that makes the child defensive and closes the dialogue, then contrasts it with a better approach. The intent is C. It is not about homework amount (A) or teaching methods (B), nor is it recommended (D).

Sleep is not merely time for the body to rest. While we sleep, the brain is thought to organize the day's information, fix the memories it needs, and clear away what it does not. People who sleep enough remember what they learned well and keep their focus more easily. When sleep is short, by contrast, memory and judgment grow dull, and physical condition itself is affected. So sleep is not idle waste to be trimmed, but active work that tunes the mind and body. What is the main idea of the passage?

Correct: B) Sleep is active work that organizes memory and tunes mind and body, and should not be taken lightly.

The passage says the brain organizes and fixes memory during sleep, that shortfall dulls function, and concludes sleep is not waste but active work. So B. A is the opposite of the text, C overstates with 'the longer the better,' and D contradicts the passage.

In the mid-nineteenth century, at one hospital mothers kept dying of high fever after childbirth. One physician noticed that the doctors were assisting births with the same hands they had used to examine corpses. When he required them to wash their hands in a chlorine solution before treatment, the number of mothers who died fell sharply. At the time the existence of disease-causing microbes was not yet known, and his claim was slow to be accepted. Later, as research into bacteria advanced, its correctness was confirmed. According to the passage, what did the physician actually require?

Correct: A) Washing hands in a chlorine solution before treatment.

The passage states that requiring doctors to 'wash their hands in a chlorine solution before treatment' sharply cut the deaths. So A. Medicine (B), stopping corpse examination (C), and windows (D) are not stated in the text.

In that port town it has long been said that when a strong wind starts blowing in from the sea in the evening, the next morning the sea is often rough. A strong evening sea wind tends to appear when a low-pressure system that has grown far off is approaching. When the low passes, the waves rise and the weather is apt to break. From long experience, the fishermen have used the look of this wind to decide whether to hold off on the next day's fishing. What can most reasonably be concluded from this passage?

Correct: D) The strong evening sea wind has been used as a clue foretelling a rough sea.

The passage says the strong evening wind is a sign of an approaching low, that the low is what roughens the sea, and that fishermen read this wind to decide on fishing. So the wind is used as a clue foretelling rough seas (D). A confuses correlation with cause, and B and C are leaps unsupported by the text.

The word 'efficiency' always sounds like a good thing. But let us pause and ask: efficiency for what end, and what is spilling out amid that speed? For instance, the habit of settling every conversation with brief points alone saves time, yet may cost the trust and fresh ideas that arise from casual small talk. There is no need to reject efficiency itself. Only, rather than making it the absolute measure, we should use it discerningly in light of what we want to value — there lies what is worth thinking about. What is the author's main intent in this passage?

Correct: A) To urge readers not to treat efficiency as the absolute standard but to weigh it against what they want to value.

The author pauses over taking efficiency as simply good, attends to what it costs, and argues against treating it as absolute, urging discerning use in light of what one values. The intent is A. It is not a blanket rejection of efficiency (B), a recommendation of brief-only talk (C), or personality analysis (D).

During summer, tree leaves are green. This is because a green pigment inside the leaves uses sunlight to make food. When autumn comes and temperatures fall, this green pigment breaks down, and hidden yellows and reds appear. In this way the leaves turn their autumn colors. What is the main idea of the passage?

Correct: C) Leaves turn their autumn colors because the green pigment breaks down.

The passage explains that a green pigment makes food and that in autumn it breaks down, revealing yellows and reds — the mechanism of autumn color. So C. A contradicts the text, and B and D are not stated.

Penguins are birds, but they cannot fly through the air. Instead, they use their wings like flippers to swim swiftly through the water. A thick layer of fat helps keep their body warm even in cold seas. On land they waddle, but in the water they are strikingly nimble. According to the passage, how do penguins use their wings?

Correct: B) Like flippers, to swim through the water.

The passage states plainly that penguins 'use their wings like flippers to swim swiftly through the water.' So B. They cannot fly (A); fat keeps them warm (C); and D is not stated.

Stepping into the kitchen, a sweet, toasty smell hung in the air. Through the oven door, a risen dough could be seen turning golden brown. On the table sat a bag of flour and several eggshells. The clock pointed to exactly three o'clock. What can most strongly be inferred from this scene?

Correct: D) Someone is baking sweets or bread.

The sweet toasty smell, the risen dough browning in the oven, and the flour and eggshells strongly point to baking sweets or bread (D). Soup (A) conflicts with this, and B and C have no basis in the text.

When you come home from being out, wash your hands first. Your hands may carry invisible dirt and germs. Lather the soap well and spend about twenty seconds washing between your fingers and around your nails, and the dirt comes off more easily. Habits like this help prevent colds and the like. What is the author's main purpose?

Correct: A) To encourage the reader to wash their hands correctly.

The passage urges handwashing, advises on lathering and timing, and says it helps prevention. The purpose is to encourage proper handwashing (A). Soap scents (B), the history of colds (C), and water bills (D) are not in the text.

Long ago, people spent days carrying letters to reach someone far away. In time the telephone was born, letting them speak by voice at once. Today we can send messages and video anywhere in the world in an instant. The means of communication have grown faster and easier with the ages. At the same time, so much information now flows that a new difficulty has arisen: choosing out the messages that truly matter. What is the passage most trying to say?

Correct: B) The means of communication became faster and easier, but a new difficulty of information overload arose.

The passage traces the progress from letters to phones to modern communication, showing both the benefit of speed and ease and the difficulty of information overload. So the main idea is B. A, C, and D are claims not in the text.

Plants make their own food using sunlight, water, and carbon dioxide. This process is called photosynthesis. The food made in the leaves travels through the stem to the roots and fruit, where it is used for growth and ripening. In the process, oxygen is released into the air as a by-product. Much of the oxygen we breathe is produced by plants in this way. According to the passage, what is released into the air during photosynthesis?

Correct: C) Oxygen

The passage states that 'oxygen is released into the air as a by-product.' So C. Carbon dioxide is used as an input (A), water is also an input (B), and food is what is transported (D); what is released is oxygen.

The library added a new 'quiet-talking allowed' section. Students doing group study, who used to be told to lower their voices, began gathering there. Then students who had come to read but said they could not settle down began saying, 'I can focus better than before.' Requests to use the section grow by the day. What can most reasonably be inferred from this passage?

Correct: A) Separating the talking area likely improved conditions for those who want to read quietly, too.

After group-study students moved to the talking section, readers said they 'can focus better than before,' and use is rising. Separating talkers from readers likely improved conditions for both (A). B, C, and D have no basis in the text.

If you get lost in the mountains, do not wander about at random. It wastes your strength and actually raises the danger of a serious accident. First, stop and think back over the way you came. If you cannot tell, stay where you are and signal your location with a whistle or a brightly colored cloth. It is also important to secure a spot sheltered from the wind before nightfall. What is the author's main purpose?

Correct: D) To instruct the reader on what to do when lost.

The passage gives a sequence of instructions: don't wander, stop, signal your location, secure shelter from the wind. Its purpose is to instruct on actions (D). It is not about scenery (A), a gear list (B), or statistics (C).

In many cities, rivers were once fouled with trash and wastewater, and the fish had vanished. As people built systems to clean the wastewater and kept up efforts to clear trash from the banks, the water gradually grew clear. In time the fish returned, and birds began to gather. At the same time, it became clear anew that such recovery takes long years and much human effort. What does the passage say as a whole?

Correct: C) Human efforts revived the river, but it took long time and labor.

The passage describes how human efforts — wastewater treatment and trash cleanup — revived the river, while also noting the recovery took long years and effort, presenting both sides. So the main idea is C. A contradicts the text's 'if left alone,' and B and D are claims not in the text.

There is a reason the sky looks blue. Sunlight is a mixture of many colors, but when it hits the tiny particles in the air, blue light scatters in all directions more strongly than the other colors. This scattered blue light spreads across the whole sky, so the daytime sky looks blue. In the evening, when the sun is low, the light passes through more air, the blue light scatters away entirely, and the remaining red light turns the sky red. According to the passage, why does the daytime sky look blue?

Correct: D) Because blue light scatters in all directions more strongly than other colors.

The passage says blue light 'scatters in all directions more strongly than the other colors,' spreading across the sky so it looks blue. So D. Air being blue (A), light being only blue (B), and sea reflection (C) are contrary to or absent from the text.

At one factory, the machines had grown old and would suddenly stop several times a month, holding up the work. When they made the bold move of replacing the old machines with new ones, sudden stoppages afterward all but disappeared. The amount they could produce steadied, and the need to work overtime to catch up dropped as well. What can most reasonably be concluded from this experience?

Correct: B) Replacing the aging machines likely helped reduce the sudden stoppages.

The old machines stopped often, and after replacement stoppages nearly vanished and production steadied, so the replacement likely helped reduce the stoppages (B). A contradicts this, C reverses the cause, and D has no basis in the text.

Press a child with 'Why haven't you done your homework?' and the child defends itself with excuses or silence, and the dialogue closes. In the same situation, saying 'Shall we look together at where you got stuck?' makes it easier for the child to explain. A single choice in how you frame the question greatly changes whether the other person opens up or shuts down. Why does the author give the example 'Why haven't you done your homework?'

Correct: C) To show that a pressing way of asking closes off dialogue.

The author presents this phrasing as a bad example that makes the child defensive and closes the dialogue, then contrasts it with a better approach. The intent is C. It is not about homework amount (A) or teaching methods (B), nor is it recommended (D).

Sleep is not merely time for the body to rest. While we sleep, the brain is thought to organize the day's information, fix the memories it needs, and clear away what it does not. People who sleep enough remember what they learned well and keep their focus more easily. When sleep is short, by contrast, memory and judgment grow dull, and physical condition itself is affected. So sleep is not idle waste to be trimmed, but active work that tunes the mind and body. What is the main idea of the passage?

Correct: B) Sleep is active work that organizes memory and tunes mind and body, and should not be taken lightly.

The passage says the brain organizes and fixes memory during sleep, that shortfall dulls function, and concludes sleep is not waste but active work. So B. A is the opposite of the text, C overstates with 'the longer the better,' and D contradicts the passage.

In the mid-nineteenth century, at one hospital mothers kept dying of high fever after childbirth. One physician noticed that the doctors were assisting births with the same hands they had used to examine corpses. When he required them to wash their hands in a chlorine solution before treatment, the number of mothers who died fell sharply. At the time the existence of disease-causing microbes was not yet known, and his claim was slow to be accepted. Later, as research into bacteria advanced, its correctness was confirmed. According to the passage, what did the physician actually require?

Correct: A) Washing hands in a chlorine solution before treatment.

The passage states that requiring doctors to 'wash their hands in a chlorine solution before treatment' sharply cut the deaths. So A. Medicine (B), stopping corpse examination (C), and windows (D) are not stated in the text.

In that port town it has long been said that when a strong wind starts blowing in from the sea in the evening, the next morning the sea is often rough. A strong evening sea wind tends to appear when a low-pressure system that has grown far off is approaching. When the low passes, the waves rise and the weather is apt to break. From long experience, the fishermen have used the look of this wind to decide whether to hold off on the next day's fishing. What can most reasonably be concluded from this passage?

Correct: D) The strong evening sea wind has been used as a clue foretelling a rough sea.

The passage says the strong evening wind is a sign of an approaching low, that the low is what roughens the sea, and that fishermen read this wind to decide on fishing. So the wind is used as a clue foretelling rough seas (D). A confuses correlation with cause, and B and C are leaps unsupported by the text.

The word 'efficiency' always sounds like a good thing. But let us pause and ask: efficiency for what end, and what is spilling out amid that speed? For instance, the habit of settling every conversation with brief points alone saves time, yet may cost the trust and fresh ideas that arise from casual small talk. There is no need to reject efficiency itself. Only, rather than making it the absolute measure, we should use it discerningly in light of what we want to value — there lies what is worth thinking about. What is the author's main intent in this passage?

Correct: A) To urge readers not to treat efficiency as the absolute standard but to weigh it against what they want to value.

The author pauses over taking efficiency as simply good, attends to what it costs, and argues against treating it as absolute, urging discerning use in light of what one values. The intent is A. It is not a blanket rejection of efficiency (B), a recommendation of brief-only talk (C), or personality analysis (D).

During summer, tree leaves are green. This is because a green pigment inside the leaves uses sunlight to make food. When autumn comes and temperatures fall, this green pigment breaks down, and hidden yellows and reds appear. In this way the leaves turn their autumn colors. What is the main idea of the passage?

Correct: C) Leaves turn their autumn colors because the green pigment breaks down.

The passage explains that a green pigment makes food and that in autumn it breaks down, revealing yellows and reds — the mechanism of autumn color. So C. A contradicts the text, and B and D are not stated.

Penguins are birds, but they cannot fly through the air. Instead, they use their wings like flippers to swim swiftly through the water. A thick layer of fat helps keep their body warm even in cold seas. On land they waddle, but in the water they are strikingly nimble. According to the passage, how do penguins use their wings?

Correct: B) Like flippers, to swim through the water.

The passage states plainly that penguins 'use their wings like flippers to swim swiftly through the water.' So B. They cannot fly (A); fat keeps them warm (C); and D is not stated.

Stepping into the kitchen, a sweet, toasty smell hung in the air. Through the oven door, a risen dough could be seen turning golden brown. On the table sat a bag of flour and several eggshells. The clock pointed to exactly three o'clock. What can most strongly be inferred from this scene?

Correct: D) Someone is baking sweets or bread.

The sweet toasty smell, the risen dough browning in the oven, and the flour and eggshells strongly point to baking sweets or bread (D). Soup (A) conflicts with this, and B and C have no basis in the text.

When you come home from being out, wash your hands first. Your hands may carry invisible dirt and germs. Lather the soap well and spend about twenty seconds washing between your fingers and around your nails, and the dirt comes off more easily. Habits like this help prevent colds and the like. What is the author's main purpose?

Correct: A) To encourage the reader to wash their hands correctly.

The passage urges handwashing, advises on lathering and timing, and says it helps prevention. The purpose is to encourage proper handwashing (A). Soap scents (B), the history of colds (C), and water bills (D) are not in the text.

Long ago, people spent days carrying letters to reach someone far away. In time the telephone was born, letting them speak by voice at once. Today we can send messages and video anywhere in the world in an instant. The means of communication have grown faster and easier with the ages. At the same time, so much information now flows that a new difficulty has arisen: choosing out the messages that truly matter. What is the passage most trying to say?

Correct: B) The means of communication became faster and easier, but a new difficulty of information overload arose.

The passage traces the progress from letters to phones to modern communication, showing both the benefit of speed and ease and the difficulty of information overload. So the main idea is B. A, C, and D are claims not in the text.

Plants make their own food using sunlight, water, and carbon dioxide. This process is called photosynthesis. The food made in the leaves travels through the stem to the roots and fruit, where it is used for growth and ripening. In the process, oxygen is released into the air as a by-product. Much of the oxygen we breathe is produced by plants in this way. According to the passage, what is released into the air during photosynthesis?

Correct: C) Oxygen

The passage states that 'oxygen is released into the air as a by-product.' So C. Carbon dioxide is used as an input (A), water is also an input (B), and food is what is transported (D); what is released is oxygen.

The library added a new 'quiet-talking allowed' section. Students doing group study, who used to be told to lower their voices, began gathering there. Then students who had come to read but said they could not settle down began saying, 'I can focus better than before.' Requests to use the section grow by the day. What can most reasonably be inferred from this passage?

Correct: A) Separating the talking area likely improved conditions for those who want to read quietly, too.

After group-study students moved to the talking section, readers said they 'can focus better than before,' and use is rising. Separating talkers from readers likely improved conditions for both (A). B, C, and D have no basis in the text.

If you get lost in the mountains, do not wander about at random. It wastes your strength and actually raises the danger of a serious accident. First, stop and think back over the way you came. If you cannot tell, stay where you are and signal your location with a whistle or a brightly colored cloth. It is also important to secure a spot sheltered from the wind before nightfall. What is the author's main purpose?

Correct: D) To instruct the reader on what to do when lost.

The passage gives a sequence of instructions: don't wander, stop, signal your location, secure shelter from the wind. Its purpose is to instruct on actions (D). It is not about scenery (A), a gear list (B), or statistics (C).

In many cities, rivers were once fouled with trash and wastewater, and the fish had vanished. As people built systems to clean the wastewater and kept up efforts to clear trash from the banks, the water gradually grew clear. In time the fish returned, and birds began to gather. At the same time, it became clear anew that such recovery takes long years and much human effort. What does the passage say as a whole?

Correct: C) Human efforts revived the river, but it took long time and labor.

The passage describes how human efforts — wastewater treatment and trash cleanup — revived the river, while also noting the recovery took long years and effort, presenting both sides. So the main idea is C. A contradicts the text's 'if left alone,' and B and D are claims not in the text.

There is a reason the sky looks blue. Sunlight is a mixture of many colors, but when it hits the tiny particles in the air, blue light scatters in all directions more strongly than the other colors. This scattered blue light spreads across the whole sky, so the daytime sky looks blue. In the evening, when the sun is low, the light passes through more air, the blue light scatters away entirely, and the remaining red light turns the sky red. According to the passage, why does the daytime sky look blue?

Correct: D) Because blue light scatters in all directions more strongly than other colors.

The passage says blue light 'scatters in all directions more strongly than the other colors,' spreading across the sky so it looks blue. So D. Air being blue (A), light being only blue (B), and sea reflection (C) are contrary to or absent from the text.

At one factory, the machines had grown old and would suddenly stop several times a month, holding up the work. When they made the bold move of replacing the old machines with new ones, sudden stoppages afterward all but disappeared. The amount they could produce steadied, and the need to work overtime to catch up dropped as well. What can most reasonably be concluded from this experience?

Correct: B) Replacing the aging machines likely helped reduce the sudden stoppages.

The old machines stopped often, and after replacement stoppages nearly vanished and production steadied, so the replacement likely helped reduce the stoppages (B). A contradicts this, C reverses the cause, and D has no basis in the text.

Press a child with 'Why haven't you done your homework?' and the child defends itself with excuses or silence, and the dialogue closes. In the same situation, saying 'Shall we look together at where you got stuck?' makes it easier for the child to explain. A single choice in how you frame the question greatly changes whether the other person opens up or shuts down. Why does the author give the example 'Why haven't you done your homework?'

Correct: C) To show that a pressing way of asking closes off dialogue.

The author presents this phrasing as a bad example that makes the child defensive and closes the dialogue, then contrasts it with a better approach. The intent is C. It is not about homework amount (A) or teaching methods (B), nor is it recommended (D).

Sleep is not merely time for the body to rest. While we sleep, the brain is thought to organize the day's information, fix the memories it needs, and clear away what it does not. People who sleep enough remember what they learned well and keep their focus more easily. When sleep is short, by contrast, memory and judgment grow dull, and physical condition itself is affected. So sleep is not idle waste to be trimmed, but active work that tunes the mind and body. What is the main idea of the passage?

Correct: B) Sleep is active work that organizes memory and tunes mind and body, and should not be taken lightly.

The passage says the brain organizes and fixes memory during sleep, that shortfall dulls function, and concludes sleep is not waste but active work. So B. A is the opposite of the text, C overstates with 'the longer the better,' and D contradicts the passage.

In the mid-nineteenth century, at one hospital mothers kept dying of high fever after childbirth. One physician noticed that the doctors were assisting births with the same hands they had used to examine corpses. When he required them to wash their hands in a chlorine solution before treatment, the number of mothers who died fell sharply. At the time the existence of disease-causing microbes was not yet known, and his claim was slow to be accepted. Later, as research into bacteria advanced, its correctness was confirmed. According to the passage, what did the physician actually require?

Correct: A) Washing hands in a chlorine solution before treatment.

The passage states that requiring doctors to 'wash their hands in a chlorine solution before treatment' sharply cut the deaths. So A. Medicine (B), stopping corpse examination (C), and windows (D) are not stated in the text.

In that port town it has long been said that when a strong wind starts blowing in from the sea in the evening, the next morning the sea is often rough. A strong evening sea wind tends to appear when a low-pressure system that has grown far off is approaching. When the low passes, the waves rise and the weather is apt to break. From long experience, the fishermen have used the look of this wind to decide whether to hold off on the next day's fishing. What can most reasonably be concluded from this passage?

Correct: D) The strong evening sea wind has been used as a clue foretelling a rough sea.

The passage says the strong evening wind is a sign of an approaching low, that the low is what roughens the sea, and that fishermen read this wind to decide on fishing. So the wind is used as a clue foretelling rough seas (D). A confuses correlation with cause, and B and C are leaps unsupported by the text.

The word 'efficiency' always sounds like a good thing. But let us pause and ask: efficiency for what end, and what is spilling out amid that speed? For instance, the habit of settling every conversation with brief points alone saves time, yet may cost the trust and fresh ideas that arise from casual small talk. There is no need to reject efficiency itself. Only, rather than making it the absolute measure, we should use it discerningly in light of what we want to value — there lies what is worth thinking about. What is the author's main intent in this passage?

Correct: A) To urge readers not to treat efficiency as the absolute standard but to weigh it against what they want to value.

The author pauses over taking efficiency as simply good, attends to what it costs, and argues against treating it as absolute, urging discerning use in light of what one values. The intent is A. It is not a blanket rejection of efficiency (B), a recommendation of brief-only talk (C), or personality analysis (D).