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【单选题】
下列物质中,在一定条件下既能发生加成反应,又能发生取代反应,但不能使酸性 KMnO 4 溶液褪色的是 ( )A.
甲烷
B.
苯
C.
乙烯
D.
乙烷
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【简答题】So far, we have l_______________ five Units in Module 7.Now let’s 1. ____________ make a brief _____________(介绍) to each unit. Unit One is about 2._____________ Marty’s story. Though he is ______...
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