选择与句中划线部分意思相同或相近的词或短语。

1. All the students went to the zoo but not Danny.

A. and          

B. so      

C. except      

D. with

2. Watching TV is very interesting.

A. a lot of fun      

B. sad      

C. good      

D. happy

3. She has invited me to go to the movies next Sunday.

A. go to a restaurant          

B. go shopping

C. go to see a film            

D. go to the park

4. We have learned something on Chinese history.

A. at            

B. in        

C. to      

D. about

5. He does well in math

A. does his homework well          

B. is good at

C. be good at                    

D. is good in

如左图为电热毯的电路示意图．电热毯接在u=311sin100πt（V）的电源插座上．电热毯被加热到一定程度后，由于装置P的作用，使加在电热丝ab两端的电压变为如右图所示的波形，从而进入保温状态．若电热丝电阻保持不变，此时左图中交流电压表读出交流电的有效值是（　　）

A．156V

B．220V

C．311V

D．110V