题目：
用所给词的正确形式填空。
1. Your father looks very (health).
2. You must look after (you).
3. (read) in bed is bad for your eyes.
4. He (be) ill yesterday.
5. I stayed away from school for (little) than a week last term.
6. You (be) not here yesterday morning.
7. Doing eye (exercise) is good for your eyes.
8. Do you like eating (vegetable)?
9. She was away for (many) than three weeks last year.
10. I (usual) get to school very early.
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：原线圈两端的有效电压值为：,根据公式可得副线圈两端电压为，A正确故选A，点评：基础题，关键是会根据表达式求解有效值，然后根据公式求解
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