关于运动和静止,下列说法正确的是   【    】A.拖拉机和收割

关于运动和静止,下列说法正确的是      

A.拖拉机和收割机以同样的速度前进时,以拖拉机为参照物收割机是运动的

B.站在正在上升的观光电梯上的人看到地面在向下运动,他是以身边的电梯为参照物

C.人在地球上看到月亮从云中穿出,是以地球为参照物的

D.我们看到宇航员出舱后能够静止,这是以地球为参照物

答案

B

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