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2013gre阅读备考:gre阅读短篇练习(二)

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2013-03-15 13:02

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【 liuxue86.com - GRE阅读 】

  As of (As of: 到...时为止;从...时起) the late 1980’s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would help or hurt a warming globe. Some studies suggested that a four percent increase in stratocumulus (stratocumulus: n.[气]层积云) clouds over the ocean could compensate for a doubling in atmospheric carbon dioxide, preventing a potentially disastrous planetwide temperature increase. On the other hand, an increase in cirrus (cirrus: n. 〈气〉卷云) clouds could increase global warming.

  That clouds represented the weakest element in climate models was illustrated by a study of fourteen such models. Comparing climate forecasts for a world with double the current amount of carbon dioxide, researchers found that the models agreed quite well if clouds were not included. But when clouds were incorporated, a wide range of forecasts was produced. With such discrepancies plaguing the models, scientists could not easily predict how quickly the world’s climate would change, nor could they tell which regions would face dustier droughts or deadlier monsoons.

  1.The information in the passage suggests that scientists would have to answer which of the following questions in order to predict the effect of clouds on the warming of the globe?

  (A) What kinds of cloud systems will form over the Earth?

  (B) How can cloud systems be encouraged to form over the ocean?

  (C) What are the causes of the projected planetwide temperature increase?

  As of (As of: 到...时为止;从...时起) the late 1980’s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would help or hurt a warming globe. Some studies suggested that a four percent increase in stratocumulus (stratocumulus: n.[气]层积云) clouds over the ocean could compensate for a doubling in atmospheric carbon dioxide, preventing a potentially disastrous planetwide temperature increase. On the other hand, an increase in cirrus (cirrus: n. 〈气〉卷云) clouds could increase global warming.

  That clouds represented the weakest element in climate models was illustrated by a study of fourteen such models. Comparing climate forecasts for a world with double the current amount of carbon dioxide, researchers found that the models agreed quite well if clouds were not included. But when clouds were incorporated, a wide range of forecasts was produced. With such discrepancies plaguing the models, scientists could not easily predict how quickly the world’s climate would change, nor could they tell which regions would face dustier droughts or deadlier monsoons.

  1.The information in the passage suggests that scientists would have to answer which of the following questions in order to predict the effect of clouds on the warming of the globe?

  (A) What kinds of cloud systems will form over the Earth?

  (B) How can cloud systems be encouraged to form over the ocean?

  (C) What are the causes of the projected planetwide temperature increase?

  想了解更多GRE阅读网的资讯,请访问: GRE阅读

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