核心单词（15个）
1、code number
2、contract
3、fax
4、popular
5、unclear
6、rate
7、routine
8、fetch
9、respectively
10、ascend
11、bear
12、confire
13、chronological
14、invoice
15、numeric
对话：
A : Lillian,would you please send me the fax again?
B : What's wrong with it ?
A : The fax you send me just now was very unclear and page three is missing.
B : I'm sorry. I'll send you the fax again right now.
