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19.Grandfathers,fathers and sons belong to three different generations.

分析 祖父、父亲和儿子属于三代人.

解答 答案是generations.本题考查语境中选用恰当的词;generation n.代;根据句意,祖父、父亲和儿子属于"三代人",故答案是generations.

点评 首字母填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等,并联系首字母,同时注意所选词的形式变化.

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