Câu hỏi:
24/07/2023 1,569
Read the passage and choose the best answer from the four options marked A, B, C or D in the following questions.
Identify your answer by writing the corresponding letter A, B, C or D on your answer sheet. (1 pts) Birds that feed in flocks commonly retire together into roosts. The reasons for roosting communally are not always obvious, but there are some likely benefits. In winter especially, it is important for birds to keep warm at night and conserve precious food reserves. One way to do this is to find a sheltered roost. Solitary roosters shelter in dense vegetation or enter a cavity – horned larks dig holes in the ground and ptarmigan burrow into snow banks – but the effect of sheltering is magnified by several birds huddling together in the roosts, as wrens, swifts, brown creepers, bluebirds, and anis do. Body contact reduces the surface area exposed to the cold air, so the birds keep each other warm. Two kinglets huddling together were found to reduce their heat losses by a quarter, and three together saved a third of their heat. The second possible benefit of communal roosts is that they act as "information centers." During the day, parties of birds will have spread out to forage over a very large area. When they return in the evening some will have fed well, but others may have found little to eat. Some investigators have observed that when the birds set out again next morning, those birds that did not feed well on the previous day appear to follow those that did. The behavior of common and lesser kestrels may illustrate different feeding behaviors of similar birds with different roosting habits. The common kestrel hunts vertebrate animals in a small, familiar hunting ground, whereas the very similar lesser kestrel feeds on insects over a large area. The common kestrel roosts and hunts alone, but the lesser kestrel roosts and hunts in flocks, possibly so one bird can learn from others where to find insect swarms. Finally, there is safety in numbers at communal roosts since there will always be a few birds awake at any given moment to give the alarm. But this increased protection is partially counteracted by the fact that mass roosts attract predators and are especially vulnerable if they are on the ground. Even those in trees can be attacked by birds of prey. The birds on the edge are at greatest risk since predators find it easier to catch small birds perching at the margins of the roost.
What does the passage mainly discuss?
Read the passage and choose the best answer from the four options marked A, B, C or D in the following questions.
Identify your answer by writing the corresponding letter A, B, C or D on your answer sheet. (1 pts) Birds that feed in flocks commonly retire together into roosts. The reasons for roosting communally are not always obvious, but there are some likely benefits. In winter especially, it is important for birds to keep warm at night and conserve precious food reserves. One way to do this is to find a sheltered roost. Solitary roosters shelter in dense vegetation or enter a cavity – horned larks dig holes in the ground and ptarmigan burrow into snow banks – but the effect of sheltering is magnified by several birds huddling together in the roosts, as wrens, swifts, brown creepers, bluebirds, and anis do. Body contact reduces the surface area exposed to the cold air, so the birds keep each other warm. Two kinglets huddling together were found to reduce their heat losses by a quarter, and three together saved a third of their heat. The second possible benefit of communal roosts is that they act as "information centers." During the day, parties of birds will have spread out to forage over a very large area. When they return in the evening some will have fed well, but others may have found little to eat. Some investigators have observed that when the birds set out again next morning, those birds that did not feed well on the previous day appear to follow those that did. The behavior of common and lesser kestrels may illustrate different feeding behaviors of similar birds with different roosting habits. The common kestrel hunts vertebrate animals in a small, familiar hunting ground, whereas the very similar lesser kestrel feeds on insects over a large area. The common kestrel roosts and hunts alone, but the lesser kestrel roosts and hunts in flocks, possibly so one bird can learn from others where to find insect swarms. Finally, there is safety in numbers at communal roosts since there will always be a few birds awake at any given moment to give the alarm. But this increased protection is partially counteracted by the fact that mass roosts attract predators and are especially vulnerable if they are on the ground. Even those in trees can be attacked by birds of prey. The birds on the edge are at greatest risk since predators find it easier to catch small birds perching at the margins of the roost.
What does the passage mainly discuss?
Câu hỏi trong đề: Bộ 20 đề ôn thi Chuyên Anh năm 2023 !!
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Trả lời:
Giải bởi Vietjack
Chọn D
Câu hỏi cùng đoạn
Câu 2:
The word "conserve" in line 3 is closest in meaning to ________.
Lời giải của GV VietJack
Chọn A
Câu 4:
The word "magnified" in line 6 is closest in meaning to _______.
Lời giải của GV VietJack
Chọn C
Câu 5:
The author mentions kinglets in line 9 as an example of birds that
Lời giải của GV VietJack
Chọn C
Câu 6:
The word "forage" in line 12 is closest in meaning to _______.
Lời giải của GV VietJack
Chọn C
Câu 7:
Which of the following statements about lesser and common kestrels is true?
Lời giải của GV VietJack
Chọn B
Câu 8:
The word "counteracted" in line 23 is closest in meaning to _______.
Lời giải của GV VietJack
Chọn B
Câu 9:
Which of the following is NOT mentioned in the passage as an advantage derived by birds that huddle together while sleeping?
Lời giải của GV VietJack
Chọn D
Câu 10:
Which of the following is a disadvantage of communal roosts that is mentioned in the passage?
Lời giải của GV VietJack
Chọn B
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Sách thầy cô Vietjack biên soạn:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Lời giải
1. big -> vast
2. make well -> do well
3. informations -> information
4. studies -> learns
5. to -> into
6. confirm to -> confirm
7. meanings for -> meanings of
8. phonological -> phonetic
9. the room -> make room for
10. at -> on
Lời giải
Lengthy as/though their discussion was/might be, the committee couldn't reach any/a decision
Lời giải
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Lời giải
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