题目内容

How time flies! Ten years ______ passed.A. haveB. hasC. isD. are

A. have
B. has
C. is
D. are

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Not only his parents but also his brother ________ to the Summer Palace. They haven’t been back.A. have beenB. have goneC.nD. has gone

A. have been
B. have gone
C. has been
D. has gone

Look! There _______ playing with the tourists on Yinhe Square. (2004包头)

A. are a number of dee
B. are a number of deers
C. is a number of deer
D. is a number of deers

调查某大学2000名学生学习情况,则总体单位( )。

A. 2000名学生
B. 2000名学生的学习成绩
C. 每一名学生
D. 每一名学生的学习成绩

工业企业的职工人数.职工工资是( )。

A. 连续型变量
B. 离散型变量
C. 前者是连续型变量,后者是离散型变
D. 前者是离散型变量,后者是连续型变量