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 will the speaker probably discuss next?

Câu hỏi liên quan

• What does “they” refer to?

• The word “solid” in paragraph 3 means most nearly the same as .................

• Which of the following is NOT true according to the text?

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• The Pilgrims immigrated to the New World because ..............

• What can be inferred about babies from this passage?

• Which of the following is true regarding the crust?

• According to the passage, all of the following contributed to the spread of English around the world _________ .

• What does the author imply about the effect of climate in the suburban biome?

• The word “microbes” in paragraph 3 could best be replaced by which of the following?

• When did the the Pilgrims make a difficult trip to across the ocean from England?

• In paragraph 2, the word “those” refers to ...............

• All of the following are defined in the passage EXCEPT ............

• The word “them” in paragraph 2 refers to .............

• According to the passage, agriculture could ____.

• What does the word “depletion” in paragraph 2 probably mean?

• In the last paragraph, what does the author imply is a major function of hypotheses?

• According to the passage, which of the following factors might spoil the tourists’ fun at Mediterranean resorts and beaches?

• The author mentions all of the following as jobs held by Moore EXCEPT ________

• According to the passage, what must the nations of the world do to find a solution?

• What is stated in paragraph 1 about Adler?