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【单选题】
丁苯橡胶的结构： 合成这种橡胶的单体应是 [ ] ① ②CH 3 -CH=CH-CH 3 ③CH 2 =CH-CH=CH 2 ④ ⑤A.
①②
B.
①③
C.
③⑤
D.
④⑤
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举一反三
【单选题】What is the conversation mainly about?
A.
The woman’s study.
B.
The woman’s friend.
C.
The woman’s trouble.
【简答题】检测集成电路是否损坏可采用哪些方法？
【单选题】---What are they ? ---They are .
A.
woman doctors
B.
women doctors
C.
woman’s doctors
D.
women’s doctors
【单选题】What is the woman's advice? The woman's advice is to ______.
A.
have more practice
B.
have more writing practice
C.
have private lessons
【单选题】— ____________________________ — My favourite food is apple. [ ]
A.
What's the date?
B.
What are you doing?
C.
What's your favourite food?
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