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【单选题】
为了设置两个表之间的数据参照完整性，要求这两个表是( )A.
同一个数据库中的两个表
B.
两个自由表
C.
一个自由表和一个数据库表
D.
没有限制
E.
可以不在同一数据库中的两个表
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反馈参考答案：
举一反三
【单选题】Now three wise men are ___________ their gifts to Jesus. [ ]
A.
gave
B.
to give
C.
giving
【单选题】What is the message of this passage?
A.
Old men are wise and should be respected.
B.
Old men should be hidden in the cellar.
C.
Old men know where young people could find grain.
D.
Young people are not as foolish as old people.
【单选题】A wise and frugal government shall _______ men from injuring one another.
A.
refrain
B.
restrain
C.
abstain
D.
restrict
【单选题】The bond of true affection had pulled us--six very different men from six different countries-across Antarctica we proved in the end that we weren't very different ______ .
A.
for all
B.
as usual
C.
in particular
D.
after all
【简答题】镰型红细胞性贫血是由（）突变引起的，地中海贫血是由（）突变引起的。
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