【备考每日练】GRE阅读题之冰箱毁灭了臭氧层

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每日一练

When released into the atmosphere, the refrigerant Freon damages the Earth's

ozone layer. A new kind of refrigerant does not have this effect. The

manufacturer claims that replacing Freon with the new refrigerant in both new

and existing refrigerators will prevent any further Freon damage to the ozone

layer apart from that being done by the Freon already in the atmosphere.

Which of the following must be true if the manufacturer's prediction is to

prove accurate?

A. Freon can be replaced with the new refrigerant without releasing any Freon

into the atmosphere.

B. The damage already done to the ozone layer is not of environmentally

significant proportions.

C. The atmosphere can reverse the damage to the ozone layer caused by the

past use of Freon.

D. The new refrigerant can counteract the damaging effects of Freon on the

Earth's atmosphere.

E. The new refrigerant causes no environmental damage of any kind when it is

released into the atmosphere.

正确答案

A

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