10．The cost of purchasing a house in key cities is usually higher than      in towns．（　�。�
A．thatB．thoseC．itD．one

分析 在重點(diǎn)城市里買房通常要比在鎮(zhèn)上買花費(fèi)要高很多．

解答 答案：A 此處that指代前面的the cost of…； those通常指代名詞的復(fù)數(shù)形式；one 只能指代可數(shù)名詞，表示泛指．而這里指代的是買房的花費(fèi)；是特指．it一般指代表示時(shí)間，天氣，動(dòng)物，事件等；故選A

點(diǎn)評(píng) 這里需要熟練掌握指示代詞的指代內(nèi)容及指代意義．如 those通常指代名詞的復(fù)數(shù)形式；one 指代是一個(gè)人或事物等．

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