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【单选题】
下列关于异常的说法正确的是A.
异常是编译时的错误
B.
异常是运行时出现的错误
C.
异常就是程序错误，程序错误就是异常
D.
以上都不对
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【单选题】---He's already been back from the USA, ___________? ---___________. He is having fun with his son at home these days. A.hasn't he; No B.isn't he; Yes C.hasn't he; Yes D.isn't he; No
A.
.hasn't he; No
B.
.isn't he; Yes
C.
.hasn't he; Yes
D.
isn't he; No
【简答题】莲的果实为______果，埋于海绵质的______内。
【单选题】—Ben hasn't been to such a beautiful place before, has he? —______. [ ]
A.
Yes, he hasn't
B.
Yes, he has
C.
No, he haven't
D.
No, he has
【简答题】环形折返线:俗称()
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