Question

（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

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。