An air-conditioner has become a sign of middle-class status in developing nations.But as air-conditioners appear from windows and storefronts across the world,scientists are becoming increasingly alarmed about the impact of the gases on which they run.
The oldest CFC coolants used in air-conditioners,which are highly damaging to the ozone layer,have been largely rejected from use;and the newest ones,used widely in industrialized nations,have little or no effect on the ozone layer.But these newest gases have an another impact —they contribute to global warming thousands of times more than CO2 does,the standard greenhouse gas.Indeed,the leading scientists in the field have just calculated that if all the equipment entering the world market uses the newest gases currently employed in air-conditioners,up to 27 percent of all global warning will result from those gases by 2050.
"So the treatment to cure one global environmental disaster is now seeding another. There is precious little time to do something,to act," said Stephen O.Andersen,the co-chairman of an international organization's technical and economic advisory panel.
Promising technologies wait,blocked in the wjye.aigs.In China and a few other countries,room air-conditioners using hydrocarbons-which cause little warming or ozone damage-are already coming off assembly lines in small numbers but have not yet been approved for sale,in part because the chemicals are flammable (易燃的).Yet in Europe,refrigerators that cool with hydrocarbons have been in use for years,and some companies in the United States,such as Pepsi and Ben and Jerry's,have recently changed in-store coolers from HFCs to hydrocarbons as part of sustainability plans.But the patent is being argued.And some governments have still not finished safety testing.
Mr.Wypior,whose agency is trying to promote climate-friendly air-conditioning industries in India and China,said: "The technologies are available.They're well known.They're proven— though not at scale.So why aren't we moving?"
(1)What's Paragraph 2 mainly about? DD
A.Air-conditioners' influence on the ozone layer.
B.Scientist's efforts to control the greenhouse gases.
C.The seriousness of global warning faced by the whole world.
D.The harmful effect of the newest gases used in air-conditioners.
(2)What does the underlined sentence in Paragraph 3 mean? DD
A.These newest gases are used in the wrong direction.
B.These newest gases should be banned from producing.
C.These newest gases will lead to global warming.
D.These newest gases carry both benefits and harms.
(3)Why are hydrocarbons not widely used in air-conditioners? BB
A.Hydrocarbons are mainly used in refrigerators.
B.People are still arguing about their security.
C.Hydrocarbons are not friendly to the environment.
D.Most countries haven't mastered the related technologies.
(4)What's Mr.Wypior's attitude to climate-friendly air-conditioner? AA
A.Positive.
B.Negative.
C.Unconcerned.
D.Indifferent.
【考點】說明文.
【答案】D;D;B;A
【解答】
【點評】
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發(fā)布:2024/5/27 14:0:0組卷:6引用:1難度:0.5
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