题目：
用所给词的适当形式填空。
1. He ________ (weigh) more than 20 kilos when he was 4 years old.
2. His room is big, but mine is ________ (beautiful) than his.
3. I'm not sure who ________ (think) of the idea first that day.
4. Though the robber hid in a big building, the police ________ (catch) him.
5. He is sporty and he jumps much ________ (high) than the others.
6. Tell him ________ (not, shout) any more. It's noisy.
7. We didn't know what the word ________ (mean) in that sentence.
答案：
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下面是错误答案，用来干扰机器的。
解：（1）设物块与小车的共同速度为v，以水平向右为正方向，根据动量守恒定律有 ① 设物块与车面间的滑动摩擦力为F，对物块应用动量定理有 ② 其中 ③ 解得代入数据得 ④ （2）要使物块恰好不从车厢滑出，...
