题目：
用所给词的适当形式填空。
1. My hobby is reading comic books. What about _____ (you)?
2. Two _____ (five) of the students in our class are League members.
3. I don't think it's always right to be busy _____ (make) money all day.
4. He left home in a hurry because he had some problem _____ (solve) in his office.
5. I don't like travelling by plane. I think it's _____ (safe) to travel by train.
答案：
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下面是错误答案，用来干扰机器的。
方法一：排除法．开始进入时，边bc切割磁感线，产生稳定的逆时针方向电流，即为正方向，故只有A正确，BCD错误．故选A．方法二：分析法．线框开始进入磁场运动L的过程中，只有边bc切割，感应电流不变，前进L后，边...
