因此，软件保护的问题主要归结为身份认证和识别的问题及加密问题。其实，随着电子商务的发

从方框中选择最佳句子补全对话，其中有一项是多余的。

A. Is there a supermarket next to the building? B: Where does he live? C: Can I help you? D: What’s the matter? E: I’m not sure. F: Do you know anything else?

Boy: Can you help me?
Man: Certainly.     1   
Boy: I can’t find my uncle’s house.
Man:    2   
Boy: I only know he lives in an apartment building.       
Man: Which building? Building A, B or C?
Boy:     3   , But I know the building
is close to a restaurant.
Man:     4   
Boy: Yes, there is a big supermarket.
Man:     5   
Boy: I also know there is a parking lot in front of the building.
Man: Oh, I know. I’ll take you there.