The climate conference was attended by 11,000 people,          it the largest UN gathering ever held.     

A. making   B. to make  C. made D. to be making

 

【答案】

A

【解析】略

 

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It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil) creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

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As pointed out at the beginning of the passage, people used to think that air pollution ______.

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       B．a(chǎn)ffected the entire eastern half of the United States

       C．a(chǎn)lmost brought worldwide effect

       D．existed merely in urban and industrial areas

As far as the greenhouse effect is concerned, the author _____________.

       A．shares the same view with the scientists

       B．is uncertain of its occurrence

       C．rejects it as being ungrounded（無(wú)根據(jù)的）

       D．thinks that it will increasingly destroy the world soon

It can be inferred from the passage that                    .

       A．raising the world’s temperature a little would not do much harm to life on the earth

       B．lowering the world’s temperature a little would lead to agricultural disasters

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       D．the world’s temperature will remain stable forever

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       A．the greenhouse effect in the world

       B．the measures to adjust the climate

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