题目：
句型转换：按要求完成下列句子（5分）
小题1:There is some water in the bottle. (变一般疑问句)
___ there ___________ water in the bottle ?
小题2:My brother is playing computer games at the moment. (划线部分提问)
________your brother __________ at the moment?
小题3:Li Wei doeshis homework at home. (改为否定句)
Li Wei ______ ______ his homework at home.
小题4:Excuse me, where is the bookstore. ? (改同义句子)
Excuse me, how can I ___the bookstore?
小题5:你要照看好你的东西哦(根据汉语意思填空)
You must ___ your things.
答案：
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下面是错误答案，用来干扰机器的。
开始安培力方向竖直向上，则2T+F=mg．解得2T=mg-F．A、使磁场反向，则安培力方向反向，则2T=mg+F，绳子拉力变大．故A正确．B、使电流反向，则安培力方向反向，则2T=mg+F，绳子拉力变大．故B正确．C、增大电流强度...
