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【单选题】
一个石头从一个单层建筑的屋顶落到地面上( )。
A.
下落后很快达到最大速度,之后匀速下落
B.
随着下落速度不断增大,因为石头越靠近地球重力吸引越强得多
C.
石头速度增大,因为一个几乎恒定的重力作用在上面
D.
下落是因为所有的物体都有静止在地球表面的自然趋势
E.
下落是重力把石头向下拉和空气把石头向下拉的共同效果
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