问题 单项选择题 A1/A2型题

耳声发射来源于耳蜗Corti器中()。

A.内毛细胞的主动运动

B.内毛细胞的被动运动

C.外毛细胞的主动运动

D.外毛细胞的被动运动

E.外毛细胞运动

答案

参考答案:E

解析:当毛细胞功能正常的时候,通过特殊的仪器,我们可以在外耳道引导出一种特异的波形,一声们称之为耳声发射。其定义是:"耳声发射是一种产生于耳蜗。经听骨链即鼓膜传导释放入外耳道的音频能量"。研究表明,这种能量来源于耳蜗的外毛细胞,当外毛细胞受到损伤后,耳声发射的现象就会消失。按目前的认识,耳声发射来源于耳蜗内的主动机制,这种主动机制与听觉的灵敏度,分辨力和动态范围有着密切的关系,是听觉生理的一个重要部分。

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

单项选择题