题目

按要求表示下列有机物: ①异戊烷(写出键线式)②4,4,5﹣三甲基﹣2﹣己炔(写出结构简式)③对甲基苯乙烯. 答案:【1】【2】CH3C≡C﹣C(CH3)2CH(CH3)2【3】Many kinds of _____ animals are disappearing or have already disappeared from the earth.    A. tame   B. unfriendly   C. wild    D. large
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