问题 单项选择题

一子代个体HLA—A位点的基因型为A3/A11,其中A3来源于父亲,A11来源于母亲,则( )

A.A3,A11同等表达

B.A3表达,A11不表达

C.A11表达,A3不表达

D.A3、A11互相抑制,都不表达

E.以上都不是

答案

参考答案:A

阅读理解

阅读理解。

     Ann is a middle school student. She is good at Chinese. But her English is not very good because she

is in China now. Ann has a good friend. Her name is Kate. Kate can speak very good English but she isn’t good at Chinese. Because she just comes from England.

     After school, they often study in Ann’s house.Ann’s brother is about twenty.He works in a big hospital. He knows much about English and Chinese. He helps Ann with her English and Kate with her Chinese. Now the two girls like English and Chinese very much. They are good students in their class. Their favorite

sports are swiming and roller-skating(轮式溜冰),and their favorite games are playing computer and flying kites. They are very happy in the school.

1. After reading we know that Ann and Kate are _______.

A. students    

B. sisters            

C. friends        

D. A and C

2. Where do they study after school?

A. In the school  

B. At Kate’s home  

C. In Ann’s house  

D. In the classroom

3. Why does Ann’s brother help them English and Chinese?

A. Because he knows a lot about English and Chinese.

B. Because he is a good teacher in the school.

C. Because he is good at teaching English and Chinese.

D. Because helping them is good for himself.

4. What are Ann and Kate’s favorite games?

A. Swimming and roller-skating          

B. Swimming and computer

C. flying kites and playing computer      

D. Roller-skating and kites

5. How are Ann and Kate in the school?

A. Hard          

B.Boring          

C. Happy      

D. Early

选择题