题目

 —David, I can't work out the math problem in this way.        —Why don't you try ______ way? Maybe it will work. A. other                       B. another                           C. every 答案：B若直线xa+yb=1经过第一、二、四象限，则（　　）A．a＞0，b＞0B．a＞0，b＜0C．a＜0，b＜0D．a＜0，b＞0