参考答案

正确答案：C
解析：推理判断题。根据题目中的sneakers找到小标题Earthquakes Strikes in Gap下第二段When the plates slide past each other，they sometimes became locked in place. A similar thing happens when you make a running leap on a sidewalk while wearing sneakers. When you land on both feet，the sneakers grab onto rough surface. Friction tends to hold your feet back while the rest of your body goes forward. You may end up falling flat on your face. (当两大板块滑动时，可能在某处被卡住，如同人穿着运动鞋，双脚同时着地，由于摩擦，双脚停止，而身体由于惯性继续向前，于是人就摔倒了)。这一段主要是用运动鞋的例子叙述摩擦力如何作用，这道题的答案是C。