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问题描述：

[单选] 苹果成熟从树上下落是因为重力，重力方向指向地。（）
A．√ 正确 B．× 错误
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答案解析：无
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上一篇：当一个物体受力，要在另一个物体表面上移动时，轮子可以减少摩擦，使物体能够在 下一篇：划龙舟的船桨是一个费力杠杆 。（）

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