题目

—         that he managed to get the information? —Oh，a friend of his helped him. A.Where was it           B.What was it          C.How was it         D.Why was it   答案：C  It was...that...引导强调句，对how进行强调。特殊疑问句，疑问词放在句首。   当乙酸分子中的O都是18O，乙醇分子中的O都是16O，二者在一定条件下反应生成物中水的相对分子质量为 A． 16 B． 18 C． 20 D． 22