新GRE考试非常人性的一点,对于考题出的很严格,经过多次锤炼之后,能考验出考生们的水平。考生们可以根据题库的题目复习新GRE考试,下面就将新GRE阅读理解真题进行解析,为考生们彻底分析在GRE阅读中出现的真题,帮助考生们复习。
15. 云和气候变化预测
As of the late 1980s, 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 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 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 worlds climate would change, nor could they tell which regions would face dustier droughts or deadlier monsoons.
15.1. The author of the passage is primarily concerned with
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