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【简答题】
数据库系统的数据完整性是指保证数据 【 6 】的特性。
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皮皮学刷刷变学霸
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【单选题】听力原文：W: Yes, we do have that color. But unfortunately we don't have the medium size now. M: In that case, I'll have to take the blue one. Q: Where does the conversation take place? (19)
A.
At a restaurant.
B.
At the cinema.
C.
In the office.
D.
At a department store.
【单选题】Although I hadn't seen him for years, I______his voice on the telephone at once.
A.
realized
B.
recognized
C.
heard
D.
discovered
【单选题】______ I get the money at once, I can't afford my education.
A.
As
B.
If
C.
Otherwise
D.
Unless
【单选题】Unfortunately we cannot accept your offer. Your prices are ().
A.
up-to-roof
B.
countless
C.
prohibitive
D.
more high
【单选题】I Peter at once although I hadn’t seen him for 10 years
A.
knew
B.
realized
C.
recognized
D.
remembered
【单选题】--Must I don’t at once? --No,____.
A.
you mustn’t
B.
you can’t
C.
you won’t
D.
you don’t have to
【单选题】I hadn't seen her for 10 years, but I ____ her at once.
A.
realized
B.
recognized
C.
knew
D.
found
相关题目：
【单选题】______ I get the money at once, I can't afford my education.
A.
As
B.
If
C.
Otherwise
D.
Unless