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【单选题】
下面关于外键的说法错误的是A.
外键是两个表之间的链接
B.
外键可以引用另外一个表中的一列或多列
C.
外键可以引用另外一个表的任何列
D.
被外键引用的列必须具有唯一性约束
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反馈参考答案：
举一反三
【单选题】I’m writing to tell you that my family ____ wild animals in Kenya next Sunday.
A.
is seeing
B.
will be seeing
C.
have seen
D.
will have seen
【简答题】计算机与其他计算工具的本质区别是计算机能够存储数据和程序。（ ）
【简答题】A．To win over control of Kenya from the Germans. B．To take strategic resources from Kenya. C．To control Kenya before all others. D．To see the Kenyans' lives improved.
【简答题】I don’t know, I __________ choose to spend a year in Paris — or perhaps I ___________ go to Kenya .
【单选题】I don't know, I ______ choose to spend a year in China or in Kenya.
A.
might
B.
could
C.
should
D.
would
【单选题】Which country was mentioned most: Kenya, Wales, or Netherlands?
A.
Wales
B.
NetheLands.
C.
Kenya
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