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(安徽安庆2009教学质量监测)In       preparation for the launching of Shenzhou VII, 4、scientists need      knowledge of weather changes.

     A. the; the            B. a; /            C. /; a            D. the; a

C


解析:

考察冠词,In preparation for是固定搭配,第二空后的knowledge指具体的一门知识的时候是可数名词,所以选C项。

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