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In______ preparation for the launching of Shenzhou VII, 4、scientists need______knowledge of weather changes.


  1. A.
    the; the
  2. B.
    a; /
  3. C.
    /; a
  4. D.
    the; a
C
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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