问题 问答题 简答题

检查泪液分泌或其成分异常的方法有哪些?

答案

参考答案:

泪液分泌减少或其成分异常可引起干眼症。可采用Schirmer试验或检查泪膜破裂时间。

(1)Schirmer试验方法是用一条5mm×35mm的滤纸,将一端折弯5mm,置于下睑内侧1/3结膜囊内,其余部分悬垂于皮肤表面,轻闭双眼,5分钟后测量滤纸被泪水渗湿的长度,如短于5mm则表明泪液的分泌减少。

(2)泪膜破裂时间(breakinguptime,BUT)的测量通过裂隙灯钻蓝色滤光片观察,在球结膜颞下方滴0.125%荧光素钠一滴,嘱患者眨眼数次,使荧光素均匀分布在角膜上,再睁眼凝视前方,不得眨眼,检查者从患者睁眼开始立即持续观察患者角膜,同时开始计时,直到角膜上出现第一个黑斑(泪膜缺损)时为止,短于10秒表明泪液分泌不足。

阅读理解

阅读理解:

     When we talk about the ways of traveling, different people may have different ideas. Some think

that trains are the best but others think ships, or cars or planes are better. I think each of them has

advantages and disadvantages.

     Traveling by train is slower than by air, but it is more comfortable. There are comfortable seats

and dining-cars. You can talk to people and enjoy the beautiful sceneries through the windows. The

train to some people is just like a big moving party.

     Some people prefer to travel by sea. Ships are not so fast as trains or planes, but traveling by sea

is a very pleasant way to spend a holiday. You can go to parties and movies on the ship, and enjoy

the blue sky and water. You may think you are the king of the world when you are on the board.

     Some people like to travel by car. You needn't be in a hurry to arrive on time as you travel by

train, ship or air. You can travel as far as you like and shop wherever you with. That is to say, you

enjoy more freedom of choices while traveling by car than by any other means.

     Other people like to travel by air. Although it may cost more than the other ways, it can save

much time, and it is more convenient to travel by air if you go abroad. That is why traveling by air

is popular for business people and students who study abroad.

根据短文内容,选择最佳答案。

1. If you travel by train, you can _________.      

A. make friends with different people

B. rest in the sleeping-cars

C. look out of the windows

D. A, B and C  

2. When you feel you are the king of the world, you are __________.      

A. sad                          

B. tried                          

C. excited and happy  

D. hungry 

3. When people go abroad, they usually take _________.      

A. a plane                                                        

B. a car or a boat

C. a boat or a train                                            

D. a train  

4. How many ways of traveling are mentioned in the passage?  

A. Five.                       

B. Four.                        

C. Three.                    

D. Two.   

5. What does the writer want to tell us in this passage?    

A. He wants to tell us that planes and trains are very fast.

B. He wants to tell us the characteristics of four different ways of traveling.

C. He wants to tell us that traveling in the past was impossible.

D. He wants to tell us that he likes traveling.

单项选择题