题目

He is very popular among his students as he always                     (试图使他们感兴趣) in his lectures.(make)   答案：tries to make them interested   一个mRNA分子有m个碱基，其中G+C有n个；由该mRNA合成的蛋白质有两条肽链。则其模板DNA分子的A+T数、合成蛋白质时脱去的水分子数分别是 [　　] A． B． C． D．