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21.might和could might表明possibility。 could应该用来表明permission.Mum said we couldgo to the football match. 22.council和counsel council议事机构，委员会a cabinet council内阁会议。 counsel商议，劝告follow sb.s counsel close牢记某人忠告。 23.economical和economic economic经济学的，经济上的an economic survey of Scotland苏格兰经济调查;an economic block.ade经济封锁;economical节俭的，经济的Hes had to learn to be more economical now that his only in.come is a small pension. 24.historical和historic historical有关历史的，历史的，the historical period历史阶段;historical personage历史人物。historic历史上有名的，有历史意义的，historic town历史名城。 25.infer和imply infer猜想，臆测，推断infer a motive from an effect从效果推知动机。 imply含有的意思Do you realize what his words imply?你理解他说话的含意吗?I do not imply that you are wrong.我的意思不是说你错了。 26.intense和intensive. intense激烈的，强烈的，紧张的an intense light强烈的灯光;intense heat酷热;an intense life奋发图强的生活。 intensive加强的，集中的深入细致的，彻底的an intensive bombardment密集炮击;an intensive study彻底的研究;an intensive reading精读。 | 
