Question

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

Answer 1

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。