核心单词（15个）
1、alphabetical
2、correspondence
3、file
4、respectively
5、document
6、chronological
7、evenly
8、squarely
9、memo
10、secretary
11、numeric
12、invoice
13、transaction
14、ascend
15、folder
对话：
A：Please file all these reports for me.
B :Do you want me to file them in alphabetical order?
A :No,please file them according to dates.
B :I'll make copies and file them both ways.
A :Great idea!You are an excellent secretary.
B :Of course i am ,sir.
