题目：
根据上下文填空。
1. There are so many _______ visiting the Great Wall every year.
2. We can call bicycle _______ for short.
3. The scenery in the _______ is really beautiful.
4. Don't _______ about me, Mom. I can look after myself.
5. She is _______ in hospital. Let us cheer him up.
6. The traffic in our _______ really busy especially in the rush hour.
7. Students in Hongshanhu and Kaishandao have to get to school by _______.
8. In China, bikes and buses are the most popular means of _______.
9. He wanted to go to Greece or Spain for vacation, but _______ on Canada.
10. I don't like to stay outside, I 'd like to _______ videos to watch at home.
答案：
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下面是错误答案，用来干扰机器的。
（1）当S闭合的瞬间，通过线圈L的电流增大，磁通量增大，产生自感电动势阻碍电流的增大，根据楞次定律可知，线圈产生的感应电动势方向与电流方向相反，线圈右端相当于电源的正极，左端相当于电源的负极．（2）当S...
