阅读理解。

                                                                        A letter

Dear Li Ting,

     My new school is very nice. There are 50 students in my class. Two girls are America. But they can speak

Chinese very well. Their fathers work in our city. Billy is an English boy. He comes from London. He can speak little Chinese. They like China very much. They also like our Chinese food. They are very friendly. How many

Chinese students are there in our class? How many Young Pioneers are there in our class? Can you guess?

Please write soon!

                                                                                                                              Love from

                                                                                                                                Liu Tan

1. Who writes the letter?

____________________________________________

2. The two girls are from __________________ .

3. Do they like Chinese food?

_________________________________________________

4. 将划线句子翻译成汉语.

_________________________________________________

5. How many Chinese students are there in the class?

_______________________________

小明通过学习得到下面几个结论，请帮他补充完整：

（1）实验表明，通电导体在磁场中会受到力的作用，受力的方向跟______方向和______方向有关．

（2）要使直流电动机中的线圈连续平稳地转动，必须使线圈一到______时就能自动改变线圈里的______，使它受力的方向总是相同的．在直流电动机里，完成这一任务的装置叫______．

（3）电动机可以把______能转化成______能．