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【简答题】
用简单化学方法区别下列化合物: 3- 溴 -2- 戊烯, 4- 溴 -2- 戊烯, 5- 溴 -2- 戊烯
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举一反三
【单选题】---Let's hurry. Listen! There . ---Oh, yes. Has the teacher come yet? ---look! Here .
A.
the bell goes, is he coming
B.
goes the bell, he comes
C.
the bell is going, he is coming
D.
goes the bell, comes he
【单选题】— Let's discuss the question raised last night, shall we? — There is no hurry for that. I _____ for a conference. [ ]
A.
headed
B.
was heading
C.
am heading
D.
have headed
【单选题】Let's hurry, there's__________time left and there are_________students at the gate.
A.
few;few
B.
little; little
C.
few; little
D.
little; few
【单选题】--Let's hurry. Listen!There________. __Oh,yes.Has the teacher come yet? ---Look! Here________.
A.
the bell goes, is he coming
B.
goes the bell, he comes
C.
the bell is going,he is coming
D.
goes the bell, comes he
【单选题】Listen! There _____. Let's hurry.
A.
the bell goes
B.
the bell is
C.
went the bell
D.
goes the bell
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