问题 选择题
用焦耳定律公式Q=I2Rt计算电流产生的热量,这个公式适用于(  )

A.纯电阻性用电器,如白炽灯、电炉等

B.电动机、电风扇等家用电器

C.电解、蓄电池充电等

D.对任何用电器都适用

答案

答案:D

阅读理解

阅读理解

Dear Amy,

     Susan is my pen pal. She's from London, England. She speaks good English. She's now in Shanghai

with her parents, because they work in Shanghai. Susan can speak a little Chinese.

     There are five people in her family, her parents, her two brothers and she. Her brothers aren't in

China. They are in England.

     She likes singing and dancing very much. Her favorite subject is music. She likes going to the movies

on weekends. She thinks it's fun. I think she's a nice girl.

     Do you want Susan to be your pen pal?

                                                                                                                                        Yours,

                                                                                                                                        Sophia

l. Susan is Sophia's        .          

A. sister      

B. aunt            

C. cousin            

D. pen pal

2. Where does Susan live now?

A. In Shanghai.                      

B. In New York.

C. In Beijing.                        

D. In London.

3. How many brothers and sisters does Susan have?

A. She has two sisters and one brother.

B. She has two brothers but no sister.

C. She has two sisters but no brother.

D. She has two brothers and one sister.

4. What's Susan's favorite subject in school?

A. Chinese.                

B. Music.

C. English.                 

D. Math.

5. Which of the following is TRUE according to the passage?

A. Susan is from China.

B. Susan is in Shanghai with the whole family.

C. Susan likes going to the movies on weekends.

D. Susan speaks good Chinese.

单项选择题