问题 单项选择题 A1型题

关于老年性动脉硬化,下列说法不正确的是()。

A.主要病理改变是血管中层纤维样变和玻璃样变,致使弹力层和肌层受损,血管弹性和舒张性降低

B.老年性动脉硬化的改变比较普遍地分布全身血管,与血压关系不大

C.管壁退行性变,管腔内血流量降低,使全身和脑血供减少,但很少造成严重组织损害

D.有明显的动静脉交叉处改变

E.视网膜动脉普遍变细,血管透明度减低,颜色变淡,反光带变暗,血管走行平直,分支成锐角

答案

参考答案:D

解析:老年性动脉硬化由于舒张压不高,动静脉交叉处很少有变化,而小动脉硬化有明显的动静脉交叉处改变。本题答案是D。

阅读理解

阅读理解。

  What is blood? Blood is a thick, red fluid which carries oxygen, water and

food to all parts of the body. It keeps the body at the right temperature (温度) and

protects it from disease.

  If you lose a lot of blood, you need new blood. You can receive new blood

from other people. This is called a blood transfusion (输送).

  People can donate (捐献) blood at a Red Cross Blood Bank. People who

give blood are called blood donors (捐献者). Some people sell their blood but

many others donate it.

  Donating blood doesn’t hurt you and it doesn’t take long. First a nurse take a

drop of blood from your finger and tests it. She does this to make sure that your

blood is healthy. Then you lie down on a bed and another nurse checks your

blood pressure (血压). After that the nurse puts a needle into a vein in your arm.

The needle is attached to a tube. The blood flows through the tube into a plastic

bag. After about 10 minutes, when the bag is full, the nurse takes the needle out of

your arm. You stay on the bed and rest for a few minutes. Finally you go into

another room and have something to eat.

  For a healthy person, donating blood is not harmful or painful. But the

blood he or she donates may save someone's life.

1. Where can people go to donate blood?

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2. Why does the nurse first take a drop of blood from the finger?

________________________________

3. What do you do after the nurse takes the needle out of your arm?

________________________________

4. Do you think you need something to drink after donating blood?

________________________________

5. Is donating blood harmful for healthy people according to the passage?

________________________________

解答题