阅读理解。

Hello, friend!

     My name is Rose. I’m an English girl. I’m twelve. I’m from London. Now I’m in Sydney. Do you know Sydney? It’s a big city in Australia（澳大利亚）. I’m in No.1 Middle school. I’m in Class Two, Grade One.

   There are forty students in our class--21 girls and 19 boys. My teachers are nice to me. I like drawing and running. My family are in Sydney, too. My

father is a doctor. My mother is a worker in a shop. They’re busy（忙）.  

     I like China. Please write to me soon.                      

                                   Yours ,                                                                      

                                   Rose

1. Is Rose English or Australian?

A. Yes, she is.        

B. No, she isn’t.    

C.She’s English.      

D. She’s Australian.

2. How many students are there in Class Two?  

A. 40.                

B. 21.            

C. 19.              

D. 50.

3.Where is Sydney?

A. It’s in China.    

B. It’s in England.    

C. It’s in Australia.      

D. It’s in America

室内照明支线的每一单相回路，一般采用不大于15A的熔断器或自动保护开关。每一单相回路所接灯头数(包括插座)一般不超过( )个。

A．15

B．20

C．25

D．30