题目

       After the 18th CPC National Congress, many new laws and polices will be       to make sure of the rapid and steady growth of china’s economy.        A. in power                  B. in control                  C. in authority               D. in force 答案：D 已知过点A＝(－2，m)和B(m，4)的直线与直线2x＋y＋1＝0平行，则m的值为 [　　] A．0 B．2 C．－8 D．8