There are many trees on sides of the street.and of the trees is still increasing year by year．( )A．both.the numberB．either.the numberC．both.a numberD．either.a number 题目和参考答案——青夏教育精英家教网—

18．There are many trees on _____sides of the street，and ______ of the trees is still increasing year by year．（　　）

	A．	both，the number		B．	either，the number
	C．	both，a number		D．	either，a number

分析在街道的两边有许多树，树的数量仍然在一年年增加．

解答答案：A．both表示"两者都"，后面跟名词复数；either表示"两者之一"，后面跟名词的单数．根据sides可知，第一个空应用both．the number of 表示"…的数量"，谓语动词用单数形式．a number of表示"大量的"，谓语动词用复数．根据is可知，应用the number of．根据题干可知，本句的意思应是树的数量仍然在一年年增加．故选A．

点评做本题时，需注意不定代词both和either，the number of 和a number of的区别和用法．

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