Last month, our English Department invited a local radio star to a public lecture on the topic of media influence on society. A.communicate B.demand C.deliver D.converse 答案:C14.一物体在水平地面上匀加速运动了5s,前2s内位移为4m,最后2s内的位移为10m,以下说法中正确的有( )A.该物体的加速度大小为2m/s2B.第3s内物体的位移为5mC.若该物体继续以不变的加速度匀加速运动3s,则8s内物体的总位移为40mD.该物体匀加速运动位移的表达式为S=t+t2