In order to lose weight, the young lady prefers to ______ regularly rather than take expensive weight-losing pills. A . hang out B . leave out C . work out D . figure out 答案:C汽车从甲地由静止出发,沿平直的公路开到乙地刚好停止运动,其速度图象如图所示,在0-t1和t1-3 t1两段时间内,汽车的(
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A.加速度大小之比为2:1
B.位移大小之比为1:3
C.平均速度大小之比为2:1
D.平均速度大小之比为1:1