問題補(bǔ)充：
單選題
In ______ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.A.the; theB.a; ∕C.∕; aD.the; a
網(wǎng)友答案：
熱心網(wǎng)友 1樓
C解析in preparation for 固定搭配；a knowledge of 某一門知識(shí)，這個(gè)時(shí)候可數(shù)。
