There is one book in the bag(对one提问)

问题描述:

There is one book in the bag(对one提问)

如果是要对这句子的问题,就是 how many books are there in the bag?
如果是针对one这个字,
one在这句子里是重点,说明有一本书.重点在书,不是数量.
如果说成there is a book in the bag.
重点就在书包里面有什么,而不是有多少本书了.