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In ______ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.


  1. A.
    the; the
  2. B.
    a; ∕
  3. C.
    ∕; a
  4. D.
    the; a
C
in preparation for 固定搭配;a knowledge of 某一门知识,这个时候可数。
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