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21. It is said that the house along the street will be demolished. A)pulled down B) rebuilt C) renovated D) constructed 21.A. demolish的基本词义为毁坏， 拆毁， 推翻。在句子中该词以被动语态的形式出现， 其宾语是句子的主语结构， 因此 demolish在句中的词义为拆毁， 因此A是答案。 语法结构补充： It is said/reported/required that据说/据报道/据要求... 需要掌握的相关近义词词组： buildput upconstruct 建造 22. The staff of the company are always courteous and helpful. A) efficient B) respectable C) well-informed D) respectful 22. D. Courteous词义单一， 其基本词义为有礼貌的， 因此D是答案。 需要掌握的相关近义词词组： efficientablecapable 能干的 23.The construction of the railway is said to have been terminated. A) resumed B) ended C) suspended D) cancelled 23.B. terminate的词义较单一， 其基本词义为结束 ， 因此B是答案。 需要掌握的相关近义词词组： ceasecompleteendfinishstopterminate 结束 24. It is postulated that population trends have an effect on economic fluctuations. | 
