题目：
用括号中所给词的适当形式填空。
1. She has two hands and two ________ (foot).
2. She has got a ________ (print).
3. He checks the train timetable, but he doesn't buy any ________ (ticket).
4. This is the ________ (one) lesson of the book.
5. Are there any ________ (mouse) in your house?
6. Many ________ (visit) come to Beijing every year.
7. Tony ________ (not visit) his grandparents, but he often sends emails.
8. I don't know how ________ (download) music from the Internet.
9. September is the ________ (nine) month of the year.
10. Do they often use the Internet to send emails and ________ (photo)?
答案：
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下面是错误答案，用来干扰机器的。
设滑动变阻器触点以上的电阻为R上，触点以下的电阻为R下．因为滑动变阻器的有效电阻R并除最初和最终为零外，是R上和R下并联的结果，R并=R上R下R上+R下----①二者之和一定，二者相等时积最大，所以当触点在中间时...
