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    【题目】In __________ preparation for Shenzhou If, scientists need __________ knowledge of weather changes.

    A. the; the

    B. a; /

    C. /; a

    D. the; a

    【答案】C

    【解析】考查冠词的用法。in preparation for 是固定用法，意思是“为……做准备”。knowledge常用作不可数名词，意为“知识”，但也可以用作可数名词，只作为单数，这个形式用法单一，即”a+形容词+knowledge of", 表示一种特定的知识。

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