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【简答题】
给可分为地面水源和（）两大类。一般城市应选取地面水源.
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反馈参考答案：
举一反三
【单选题】The story implies that the author's mother was______.
A.
critical
B.
fault-finding
C.
optimistic
D.
pessimistic
【单选题】Why did the author's mother beat him?
A.
Because she saw him playing with the lead cowboy.
B.
Because his brother informed his mother of his stealing.
C.
Because he had been chasing his neighbor's cats.
D.
Because he left the house without having told his mother.
【单选题】删除学生表中专业zno为空的学生记录,正确的命令是
A.
delete * from student where zno is null
B.
delete from student where zno=null
C.
delete from student where zno is null
D.
delete from student where zno is 'null'
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