题目内容
3．advantage（反义词）disadvantage．分析 advantage"优点"，disadvantage"缺点"
解答 答案：disadvantage
advantage（优点），其反义词是加前缀dis构成disadvantage，意思是"缺点"，所以答案是：disadvantage
点评 给单词加前缀或后缀是英语构词的一种重要方法．加前缀一般会改变词义，保持原来的词性；后缀通常会改变单词的词性，构成意义相近的其他词性；少数后缀还会改变词义，变为与原来词义相反的新词．
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One evening he heard a knock at the door．（79）A．He thought he had a bad cold and he asked him to take some medicine．After that the man left．（80）D．
On the third day a young man came in and said，"Thank you very much，doctor!"
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