There are in the building.and Tom lives on ．( )A．twenty floors.the twentieth floorsB．twenty floors.twentieth floorC．twenty floors.the twentieth floorD．twenty floor.twentieth floors 题目和参考答案——青夏教育精英家教网—

19．There are _______ in the building，and Tom lives on _______．（　　）

	A．	twenty floors，the twentieth floors
	B．	twenty floors，twentieth floor
	C．	twenty floors，the twentieth floor
	D．	twenty floor，twentieth floors

分析大楼里有二十层楼，汤姆住在第二十层上．

解答答案：C．
根据题干，本句的意思是大楼里有二十层楼，汤姆住在第二十层．基数词表示数量，一以上的数应该用名词复数形式，第一个空应填表示有二十层，这里用基数词twenty．而且后面用名词复数形式floors；序数词表示顺序，后面跟名词单数形式，第二个空表示在20层上，应用序数词the twentieth，后面跟名词的单数形式．故选C．

点评本题考查数词的用法，做题时注意区分基数词和序数词的用法．

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