第5题: [单项选择]The chemistry teacher asked the pupils what water was ______ of. A. consisted B. compounded C. composed D. conceived 参考答案:C 答案解析:[解析] 题干大意为:化学老师问同学们水是由什么组成的。be composed of意为“由……构成”;而consist常用作consist of,意为由什么构成,通常不用于被动语态;compound
第27题: [单项选择]删除视图STUDENT的命令是( )。 A. DELETE STUDENT VIEW B. DELETE STUDETN C. DROP STUDENT VIEW D. DROPVIEW STUDENT 参考答案:D 答案解析:[解析] 视图由于是从表中派生出采的,所以不存在修改结构的问题,但视图可以被删除。删除视图的命令格式是:DROP VIEW<视图名>。