Câu hỏi:
04/04/2020 753Read 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 questions.
Today I’d like to begin a discussion on the problem of the heating up the earth. First, we’ll touch on the relationship between fluorocarbons and the ozone layer. You probably remember that the ozone layer is the protective shield around the earth. It is important to all life, because it filters out harmful ultraviolet light from the sun. Ozone itself, a form of oxygen, is regularly made by the action of the sun in the upper atmosphere. It is also regularly destroyed by natural chemical processes.
The problem now is that too much of the ozone layer is being destroyed. Scientists suspect that certain chemicals, such as fluorocarbons, are contributing to the depletion of the ozone layer. And how do we use fluorocarbons? The most common uses are in spray cans and cooling systems. The chemical pollution from these fluorocarbons can account for some of the ozone losses that have been reported. There are, however, new studies linking the sun itself to the depletion of the ozone layer. We’ll go into that new study more next time.
What is the ozone layer made of?
Sách mới 2k7: 30 đề đánh giá năng lực DHQG Hà Nội, Tp. Hồ Chí Minh, BKHN 2025 mới nhất (600 trang - chỉ từ 160k).
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Trả lời:
Đáp án A
Tầng ozone được tạo bởi?
A. Khí oxy
B. Màng chắn
C. Tia cực tím
D. Floruacacbon
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Tom and Linda are talking about jobs they would like to choose.
- Tom: “I think working as a doctor is a challenging job.”
- Linda: “________.”
Câu 2:
__________, the balcony chairs will be ruined in this weather.
Câu 4:
Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
The movie bears little resemblance to the original novel.
Câu 5:
Mark the letter A, B, C, D on your answer sheet to show the underlined part that needs correction.
The audience was enjoying every minute of the performance.
Câu 6:
I know you didn’t want to upset me but I’d sooner you ________ the whole truth yesterday.
Câu 7:
A fire in the ________ building could be a problem for firefighters.
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