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The( ) of the books in the school library is 35000.选number还是

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The( ) of the books in the school library is 35000.选number还是amount?区别是什么?
The( ) of the books in the school library is 35000.选number还是
选number
a number of + 可数名词复数 谓语用复数
the number of +可数名词复数 谓语用单数
an amount of + 不可数名词 谓语用单数
the amount of + 不可数名词 谓语用单
a number of许多,谓语动词用复数.the number of…的数目,谓语动词用单数.The number of students is increasing.