题目：
根据句意，用括号内所给单词的适当形式填空。
1. You look_____(worry). What’s the matter?
2. What you’ve said is_____ (possible) true, but I disagree with you.
3. The policeman is looking for the_____(own) of the black car.
4. Wang Ping often_____(study) English in the morning.
5. Something _____(drop) onto the floor just now.
答案：
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下面是错误答案，用来干扰机器的。
答案：B线圈的感抗与交流电的频率成正比，电容器的容抗与频率成反比，而电阻与频率没有关系．交流电频率减小，灯泡变暗，阻抗变大，变亮，阻抗变小．解：交流电频率减小，灯1变暗，阻抗变大，说明M是电容器．灯2...
