Câu hỏi:
18/04/2020 230Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the question.
All living cells in an animal's body require energy to power the various chemical processes going in inside them. This energy is ultimately supplied by the food that animals eat. These chemical processes are collectively referred to as metabolism, and one of the byproducts of metabolism is heat. Metabolic rates vary significantly between species. Warm-blooded animals (birds and mammals) have metabolic rates about five to ten times higher than those of similarly sized cold-blooded ones (reptiles, amphibians, and fishes). And it is precisely because birds and mammals have such high metabolic rates that they are able to keep their bodies warm.
The terms warm-blooded and cold-blooded are still in everyday use, but they are not entirely precise. Anyone who has handled a snake knows this because a snake’s body actually feels quite warm. But very little of the snake’s body heat originates internally, from its cells, most of it having been supplied from the outside, either by the sun or by a heat lamp. Instead of referring to reptiles as cold-blooded, they are best described as ectothermic, meaning “outside heat”. Similarly, birds and mammals are said to be endothermic, meaning “inside heat”.
There are advantages and disadvantages to each thermal strategy. Reptiles are usually sluggish first thing in the morning, their body temperatures having dropped during the cool of the night. Accordingly, they have to bask in the sun to raise their body temperatures, but once they have warmed up sufficiently, they can go about their business. By altering between the sun when they are too cool, and the shade when they are too warm, many reptiles are able to maintain their body temperatures at optimum levels of about 95°F or more. Endotherms, on the other hand, maintain temperatures of about 98°F all the time, so they are always ready for action.
I used to keep a crocodile. He had very sharp teeth, and I had to be careful how I handled him during the daytime, when he was warm. But I could do whatever I wanted at night, when he was cold, without any fear of being bitten. The obvious disadvantage of being ectothermic is that the animal’s activity levels are dependent upon the environment. But its low metabolic rates mean that it requires far less food, which is an advantage. I used to feed the crocodile a tiny piece of liver once a week, while the family cat demanded three meals every day. We should therefore not think that reptiles are inferior to mammals and birds; they are just different
What does the word “they” in paragraph 2 refer to?
Đáp án chính xác
Câu hỏi trong đề:
24 ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 Môn thi: TIẾNG ANH !!
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
Quảng cáo
Trả lời:
Giải bởi Vietjack
Chọn C
Kiến thức: Đọc hiểu
Giải thích:
Từ “they” ở đoạn 2 nói đến cái gì?
A. tế bào
B. rắn
C. loài bò sát
D. động vật có vú
Thông tin: Instead of referring to reptiles as cold-blooded, they are best described as ectothermic, meaning “outside heat”.
Tạm dịch: Thay vì nói các loài bò sát là loài máu lạnh, chúng tốt nhất nên được gọi là động vật biến nhiệt, có nghĩa là "ngoại nhiệt" (nhiệt từ bên ngoài).
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 2:
The captain has not decided yet where to stop on the journey – we’ll just play it by_______ and see how we feel
Xem đáp án »
18/04/2020
22,708
Câu 3:
We’ve had a burglar alarm installed in our holiday cottage _______we will feel happier about leaving it unoccupied for long periods
Xem đáp án »
18/04/2020
13,133
Câu 4:
“If I were in your shoes, I would try to finish the pre-lab report before carrying out the experiment” said the professor to his research student.
Xem đáp án »
18/04/2020
9,768
Câu 5:
The receptionist didn’t know_______ whom the message was intended
Xem đáp án »
18/04/2020
7,581
Câu 6:
The committee, in an earlier report, was accused of sweeping financial problems under the carpet to avoid embarrassment
Xem đáp án »
18/04/2020
7,399
Câu 7:
What is most striking is that most authors made_______ efforts to secure proper authorization for their works
Xem đáp án »
18/04/2020
7,025
về câu hỏi!