A. The Interaction of Gases and Water Vapor Producing the Greenhouse Effect B. Why It Is Difficult to Create the Perfect Compute

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问题 A. The Interaction of Gases and Water Vapor Producing the Greenhouse Effect
B. Why It Is Difficult to Create the Perfect Computer Model
C.  How Certain Factors Can Both Increase and Decrease: Temperatures at the Same Time
D. The Possibility That Increased Temperatures May Be Due to Normal Fluctuations
E. Development of Computer Models
F. The Main Culprit Behind the Recent Warming
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选项

答案D

解析 见第五段二、三、四句。第二、三句讲到“clouds”既可遮蔽地球表面,使地球凉爽,又可以吸收热量,使地球升温。第四句说“Aerosols”也是同样难以捉摸,意即它也同时具有升温和降温作用,故选D。
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