【单选题】【消耗次数：1】
聚四氟乙烯(塑料王)为高分子化合物，属于（）。
①
烷烷烃
②
烯烃
③
卤代烃
④
醇类
参考答案：
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“不粘锅”饮具是在金属锅的内壁上涂一薄层聚四氟乙烯制成，下列各项对聚四氟乙烯的叙述中正确的是( )。
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【判断题】
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synchronic
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descriptive
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diachronic
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general
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Lexicology, a branch of linguistics, deals with_______of words.
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the nature
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the history
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forms and structures; meanings
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forms; structures and meanings
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meanings and forms; structures