题目

– How do you study _______ a test?-- I studyworking with a group. A . for; by B . by; in C . for; from D . of; by 答案：A汽车以大小为20m/s的速度做匀速直线运动。刹车后，获得的加速度的大小为5m/s2，那么刹车后2s内与刹车后6s内汽车通过的路程之比为A．1∶1B．3∶1C．4∶3D．3∶4