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【单选题】
数据库benet中有个员工表employees,该表中有职务列,你想检查哪些员工的信息中没有填写职务一栏,应该使子句( )A.
select * from employees where 职务=null
B.
select * from employees where 职务='null'
C.
select * from employees where 职务 is null
D.
select * from employees where 职务 is 'null'
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举一反三
【单选题】Why does the professor mention the effect of education on Native American societies?
A.
to indicate the content of a course he thinks the woman should take.
B.
to learn more about the woman's experiences over the summer.
C.
to describe a research project he thinks the woman would find interesting
D.
to show his approval of the woman's career goals.
【单选题】听力原文：M: The native American craft exhibit closed this afternoon. W: Oh, no. I've wanted to see that for months. Q: What does the woman imply? (14)
A.
She wanted to show people her crafts.
B.
She has seen the exhibition.
C.
She'd rather go hack home.
D.
She's sorry to have missed the exhibit.
【单选题】The example of Native American Iroquois is used in paragraph 2 to ______.
A.
show the differences between nations and states
B.
discuss the differences between internal and external affairs
C.
indicate their strive to form. a state
D.
present their identity as a people
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