A：When you comunicate with your friends,which do you prefer,letter or email.
B：I used to use letter.But now I prefer to use email.
A：Why?I think if we use letter.We can also find some remembering of friendship.But if we choose email,ten years later,there will be nothing.
B：You can't follw the times.It will cost you more time to write a letter,and you have to send it to the post office,then three days later,your friend receives the letter.The process costs at least 3 days and maybe one week in some mountain area.
But if write a email,you need ten minutes only,how effcient the job is,what you need is one computer or a cellphone.
A:You are right.There are few prople to write letter.