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【单选题】
听力原文：M: Excuse me, I have a ticket for the 6 o'clock flight to New York, but I'm afraid I can't make it. Is there a seat available for tomorrow morning? W: Let me see. I'm sorry, all the morning flights have been booked up. The earliest we can get for you is the two o'clock flight in the afternoon. Q: What docs the conversation tell us? (15)A.
The man has changed his destination.
B.
The man is returning his ticket.
C.
The man is flying to New York tomorrow morning.
D.
The man can't manage to go to New York as planned.
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【简答题】关系模式的三类完整性约束条件分别是 ________ 、参照完整性约束和用户算定义完整性。
【单选题】The old-fashioned elevator us two thousand dollars.
A.
costs
B.
cost
C.
spends
D.
spend
【简答题】关系模式的三类完整性约束条件分别是 ______ 、参照完整性和用户自定义的完整性。
【单选题】Two thousand dollars a month is not a fortune but will help cover my living _______.
A.
fees
B.
expenses
C.
fares
D.
charges
【简答题】关系模式的三类完整性约束条件分别是实体完整性、______________和______________。
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