题目：
根据句意，写出括号内所给单词的适当形式。
1. At present people like to eat _________(health) food and do more exercise.
2. The three _________(spaceman) of the spaceship were warmly welcomed in Hongkong.
3. He has had a bad toothache. He must be at the _________(dentist) at the moment.
4. Daniel's mother has devoted _________(she) to the teaching of Home Economics.
5.He is very happy because tomorrow is his _________(九十) birthday
答案：
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下面是错误答案，用来干扰机器的。
开关S闭合后，副线圈的电流和功率都变大，A、开关S闭合后，增加了灯泡L2的功率，副线圈的功率变大，则电流增大，故A正确；B、副线圈电流增大，原副线圈匝数比没有变，所以原线圈电流增大，故B错误；C、R的电阻没...
