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.

Question 113: Who is the most likely speaker?

A. A mechanic            B. A chemist               C. A professor             D. A doctor

Question 114: What does the word “filters out” in paragraph 1 probably mean?

A. prevents      B. separates                 C. keeps          D. stops

Question 115: What is the most important purpose of the ozone layer?

A. Shielding the sun                B. Protecting the earth

C. Destroying chemicals         D. Providing fluorocarbons

Question 116: What does the word “depletion” in paragraph 2 probably mean?

A. deletion      B. deployment            C. departure                D. destruction

Question 117: What is the ozone layer made of?

A. Oxygen       B. Shields        C. Ultraviolet light      D. Fluorocarbons

Question 118: The speaker’s main topic is                   .

A. air-conditioning systems           B. fluorocarbons and the ozone layer

C. ultraviolet light                          D. the use of spray cans

Question 119: What will the speaker probably discuss next?

1. The make-up of the ozone layer.
2. The sun as a cause of ozone layer depletion.
3. How to make air conditioners with fluorocarbons.
4. Harmful effects of ultraviolet light.

Tuyển Chọn 366 Câu Đọc Hiểu Các Trường Không Chuyên Phần 2