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阅读理解：

The opportunity to escape the realities of everyday life is,I think,the main attraction of a bookshop.There are not many places where it is possible to do this.A music shop is very much like a bookshop.You can go to such places as much as you wish.If it is a good shop,no assistant will approach you with the greeting： "Can I help you,sir?" You needn't buy anything you don't want.In a bookshop,an assistant should remain in the background until you have finished reading.You may want to find out where a particular section is.Then,and only then,are his services necessary.But when he has led you there,the assistant should leave politely and look as if he is not interested in selling a single book.

An assistant in a bookshop helps you ______.

A.on your entering the shop

B.just before you finish reading

C.only when you want to find out where a particular section is

D.when you are reading

正确答案：C

答案解析：In a bookshop,an assistant should remain in the background until you have finished reading.You may want to find out where a particular section is.Then,and only then,are his services necessary.在书店里,店员只是在你想知道具体的书籍的位置时,他才会帮你。

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