一物体做匀速直线运动,通过45 m的路程用了30 s的时间,则它在前15 s路程内的速度为___________m/s,通过的路程是______m;它通过72m路程所用时间为______s. 答案:1.5 22.5 48— Who ____________ to clean the blackboard ____________ afternoon?— The students of Team Two are.
[ ]A. going; this B. are going; beforeC. want; thisD. would like; in the