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【单选题】
参照完整性规则:表的( )必须是另一个表主键的有效值,或者是空值。A.
候选键
B.
外键
C.
主键
D.
主属性
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反馈参考答案：
举一反三
【简答题】This businessman has achieved some success by misleading people about his intentions.
【单选题】“Although human beings have made much progress in gender equality, there is still a long way to go if the real equality is to be achieved. For some sex discrimination is so deeply-rooted that some peo...
A.
The second sentence is not complete.
B.
“For” is used to indicate reasons.
C.
The sentence would be correct if “for” is replaced with “because”.
D.
“For” is a conjunction and should be used to join two sentences instead of leading a single independent sentence.
【单选题】Some people achieved great success even though they did not have college diplomas. ______ of this is the founder of Microsoft, Bill Gates, who dropped out of Harvard in his junior year. (U1-A)
A.
A lesson in point
B.
A wonderful example
C.
An old saying
D.
A perfect story
【单选题】Some people believe that proficiency in a foreign language is not achieved through teaching and learning but_____ through actual use.
A.
derived
B.
acquired
C.
benefited
D.
received
【简答题】Some people achieved great success even though they did not have college diplomas. ______ of this is the founder of Microsoft, Bill Gates, who dropped out of Harvard in his junior year.A. A lesson in ...
【单选题】Some people believe that proficiency in a foreign language is not achieved through teaching and learning but ________ through actual use.
A.
received
B.
accepted
C.
derived
D.
acquired
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