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听力原文：M: I wish I could get used to this American custom of using first names. W: I usually call just my good friends by their first names. Q: What is the man complaining about? (17)A.
Not getting what he wants.
B.
A custom that is new to him.
C.
Calling up customers.
D.
Some of his good friends.
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举一反三
【单选题】She really wanted to say something at the meeting, but eventually______from it.
A.
refrained
B.
prevented
C.
limited
D.
restricted
【单选题】Since she’s on a diet, Stella refrained from eating a second piece of carrot cake.
A.
to stop oneself
B.
to return
C.
to keep going
D.
to evaluate
【简答题】A．πA,B,C(σA＜C(R×S)) B．πR.A,R.B,R.C(σR.A＜S.B(R×S)) C．πR.A,S.B,S.C(σR.A＜S.C(R×S) D．πS.A,S.B,R.C(σR.A＜S.C(R×S))
【简答题】设A={a，b，c}，A上的关系R和S定义如下： R={〈a，b〉，〈b，b〉，〈b，c〉}，S={〈a，c〉，〈b，c〉，〈c，c〉}， 求关系R∪S，R∩S，R-S，S-R，R S．
【简答题】She refrained from laughing.
【简答题】She refrained from laughing.
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