— _____ students are there in your class

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问题选择题

— _____ students are there in your class, Mr. Li?

— Fifty. [ ]

A. How old

B. How much

C. How many

D. what

答案

答案：C

单项选择题

对于学生信息表：student(sno，sname，sex，age，grade)，查询学习成绩为空的学生的学号和姓名，下面语句正确的是

A．SELECT sno，sname FROM student WHERE grade=NULL

B．SELECT sno，sname FROM student WHERE grade IS NULL

C．SELECT sno，age FROM student WHERE grade IS NULL

D．SELECT sno，age FROM student WHERE grade=NULL

问答题简答题

“性恶论”是哪位儒家代表人物提倡的？