| 就一些实际生活中的现象，某同学试图从惯性角度加以解释，其中正确的是（ ） A．采用了大功率的发动机后，某些一级方程式赛车的速度甚至能超过某些老式螺旋桨飞机的速度．这表明，可以通过科学进步使小质量的物体获得大惯性 B．射出枪膛的子弹在运动一段距离后连一件棉衣也穿不透，这表明它的惯性小了 C．货车运行到不同的车站时，经常要摘下或加挂一些车厢，这些会改变它的惯性 D．摩托车转弯时，车手一方面要控制适当的速度，另一方面要将身体稍微向里倾斜，通过调控人和车的习惯性达到行驶目的 |
答案：C
| 阅读短文，选词填空。每空一词，每词只使用一次（其中有两项是多余的）。 | |
1. Life is short. While you are _ 3 it today, you'll realize you are at the end of it tomorrow. So the earlier you start to value your life, the 4 you can enjoy it. 2. You might not be successful 5 you don't study hard, although a lot of successful people haven't 6 _ higher education. 3. I don't expect you to support (供养) me for the rest of . 7 _ life, so I'm not going to do the same for you. You will be living on your own when you grow up. 4. You can require yourself to be nice to others, 8_ you shouldn't expect the same from others. 5.I've been buying the lottery ( * * ) for almost twenty 9 , but I'm still poor. l have never got the 10 place even once. So you have to work hard to be successful. There is no free lunch in the world. |