题目:
__________, he talks a lot about his favorite singers after class.
A.A quiet student as he may be
B.Quiet student as he may be
C.Be a quiet student as he may
D.Quiet as he may be a student
答案:
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答案:C题目分析:根据概念进行判断:单质是由一种元素组成的纯净物,酸是在水溶液中解离出来的阳离子全部是氢离子的化合物;碱是在水溶液中解离出来的阴离子全部是氢氧根离子的化合物;盐是由金属离子或铵根离子...