若点A（2，n）在x轴上，则点B（n-2，n+1）在（　　）

A．第一象限

B．第二象限

C．第三象限

D．第四象限

We are taught that a business letter should be written in a formal style ________ in a personal style.[ ]

A. rather than  

B. other than

C. better than 

D. more than