1/5单选题
难度：
1.
假如没有摩擦，下列哪种现象不可能发生（ ）
| A | 地面上滚动的球、行驶的车辆很难停下来 |
| B | 手拿不住写字的笔 |
| C | 人可以在地面上行走如飞 |
| D | 用吹灰之力可以推动火车沿轨道运动 |
正确答案：Qw==
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
