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多选题.doc A. 选项A.doc B. 选项B.doc C. 选项C.doc D. 选项D.doc
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皮皮学刷刷变学霸
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【单选题】She’s an excellent swimmer and he’s a fantastic runner. They’re both so...
A.
studious
B.
hardworking
C.
athletic
D.
polite
【单选题】He has his faults, but _____ he is an excellent teacher and we all respect him.
A.
all in all
B.
as a result
C.
all the best
D.
in other words
【简答题】设关系R和S的属性个数分别为r个和s个，其中两个关系只有一个相同的属性，那么 操作结果的属性个数为______。
【简答题】A．Because there is an excellent bus service. B．Because there is an excellent railway service. C．Because there is all excellent subway system. D．Because taxi system there isn't convenient.
【单选题】My neighbor ______ her own daughter as an excellent secretary!
A.
acquainted
B.
introduced
C.
recommended
D.
presented
【简答题】设关系R和S的属性个数分别为r个和s个，其中两个关系只有一个相同的属性，那么R S操作结果的属性个数为【 】。
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