题目

By no means      true that all native speakers of English know their own language very      well．     A．is that                B．that is                  C．is it                   D．it is 答案：C为了奖励兴趣小组的同学，张老师花92元钱购买了《智力大挑战》和《数学趣题》两种书。已知《智力大挑战》每本18元，《数学趣题》每本8元，则《数学趣题》买了（       ）本。