—Howlong______here? —Onlytenminutes.Tim_

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问题选择题

—How long ______ here?

—Only ten minutes. Tim ______ here with me. [ ]

A. are you; has walked

B. are you; walked

C. have you been; walked

D. have you been; has walked

答案

答案：C

单项选择题

美国布鲁姆（Blum）于1976年提出的决定人群健康状况的公式：Hs=f（e）+AcHs+B+LS中，AcHs表示。（）

A.环境因素

B.生物遗传因素

C.行为生活方式

D.保健设施的易获得性

E.以上都不是

单项选择题

对于学生信息表：student(sno，sname，sex，age，dept)，能够得到年龄在20岁于22岁之间的学生的姓名和学号的语句是

A．SELECT * FROM student WHERE age BETWEEN 20 AND 22

B．SELECT sname，sno FROM student WHERE age BETWEEN 20 AND 22

C．SELECT sname，sno FROM student WHERE age＞=20

D．SELECT sname，sno FROM student WHERE age＜=22