阅读理解。

     Lucy shows the weights of her classmates. She draws a chart to show the different weights in her

class.

1.What is the weight of most of the students?   

A.55kg.    

B.50kg.      

C.10kg.

2. How many students only weigh 30 kg?                      

A. Three students.            

B. Thirty students.              

C. We can't get the answer.

3. How many students weigh 80 kg?                  

A. One.                        

B. None.                        

C. We don't know.

4.Which of the following is not true?                  

A.4 students weigh 40 kg.                

B. Only one student weighs 70 kg.

C. Most students weigh 55 kg.

5. How many girl students are there in Lucy's class?         

A.38.                  

B.40.                  

C.We don't know.

采用（）的方法，可以提高电脱盐油水混合效果。

A、安装混合器

B、安装偏转球型阀

C、注入原油泵进口

D、注入原油泵出口