问题 单项选择题 A1型题

关于眼动检查,下列说法正确的是

A.用裸眼检查时,眼震强度可以分为4型

B.平稳跟踪试验眼动曲线分4型,Ⅰ型、Ⅱ型主要见于脑干和小脑病变

C.Tullio现象仅见于外淋巴瘘患者,正常人不会出现

D.瘘管试验阴性者不能排除瘘管存在可能

E.位置性眼震仅见于中枢性前庭系病变者

答案

参考答案:D

解析:

用裸眼检查时,眼震强度可以分为3度。平稳跟踪试验眼动曲线分4型,Ⅲ型、Ⅳ型主要见于脑干和小脑病变。

Tullio现象指强声刺激可引起头晕或眩晕现象,见于外淋巴瘘患者或正常人。由于瘘管可被病变组织堵塞,域为机化物局限不与外淋巴隙相通,以及在死迷路时,瘘管虽存在却不激发阳性反应,故瘘管试验阴性者不能排除瘘管存在可能,应结合病史及其他检查结果判断。

无论中枢性或周围性前庭系病变,均可引起位置性眼震。

阅读理解

阅读理解。

     The ostrich (鸵鸟) is the largest bird in the world. From far away , it looks more like a camel than a

bird. It has a long neck, long legs and a walk like a camel. Its eyes are very large and sharp . Like the

camel ,  the ostrich can go for a long time without water . It lives in sandy desert , too .

Its wings are too short for flying , but they do help the ostrich to run fast. The wind gets under the wings

and lifts the bird off the ground . In this way , it can take very long steps. An ostrich can run faster than a

horse .

     Ostriches are  big and strong , but sometimes they do not seem very smart.

     When they are afraid, they run around in circles.

     Ostrich eggs are large . The shells are very strong . They are so strong that they can be used for cups

and bowls.

1.The ostrich ________

A. is larger than a camel

B. is as large as a camel

C. is larger than any other bird

D. looks like each other

2. The ostrich and camel both have ________

A. sharp eyes            

B. long legs

C. short wings            

D. to go without water

3. The ostrich ________

A. can fly fast with the help of its wings 

B. can run fast with the wind

C. can’t fly because it has such short wings 

D. can run fast with the help of its wings

4. What can lift the ostrich off the ground?

A. its wings    

B. its legs    

C. The wind    

D. its long neck

5. People can use ________ for cups and bowls.

A. the shells of ostrich eggs        

B. ostrich eggs 

C. ostrich itself                  

D. ostrich wings

单项选择题 A1/A2型题