题目

The book, which ______ for children under 10 when ________, are popular with adult readers.      A. intended; written     B. was intended; being written  C. intended; writing     D. was intended; written   答案：D 下列关于水的说法错误的是     A、淡化海水可解决淡水紧缺问题           B、长期饮用硬水对人体的健康不利　　     C、日常生活中的水大多是混合物　　       D、过滤能除去天然水中的所有杂质