In order to ______ a good knowledge of English, he gave up his job and went to study in an English

school.[ ]

A. require            

B. acquire          

C.  inquire          

D. address

Outlook中每一个通讯薄，都有一个相应的文件与之相对应的文件的扩展名为：（）。

A.*.PAB

B.*.PST

C.*.RWZ

D.以上选项都不正确