题目

从方框中选择5个恰当的句子补全对话。 A:It’s very late. Are you still on the computer? B:Well, yes.   1    A:What kind of e-mails? B:Some are messages from my friends and some are from the relatives. A:Do you have to write them back right away? B:  2   Usually people want a quick reply. A:  3  B:I’ve already had 40 people’s addresses in my address book!   4    A:  5   E-mail is really very convenient(方便的).A. And I think e-mail is one of the best ways to communicate with others. B. I’ve got so many e-mails to go through. C. I agree with you17．$\frac{8}{5}$：$\frac{1}{2}$化成最简整数比是16：5．