问题 单项选择题

有关结核杆菌引起的变态反应,下列叙述哪项是不正确的

A.多发生于结核菌侵入人体后4~8周

B.为身体组织对结核菌及其代谢产物产生的过敏反应

C.局部可出现渗出性炎症,但不出现干酪样坏死

D.结核菌素试验呈阳性反应

E.可出现皮肤结节性红斑

答案

参考答案:C

解析:[解题思路] 结核变态反应为身体组织对结核菌及其代谢产物产生的过敏反应,一般发生于结核菌侵入人体后4~8周,此种反应可使局部出现渗出性炎症,也可出现干酪性坏死,常可伴发热。此时行结核菌素试验可呈阳性反应,为Ⅳ型变态反应。结核苗感染后还可发生多发性关节炎、皮肤结节性红斑等。[命题规律] 考察“结核的变态反应过程”。重点掌握。

单项选择题 A1/A2型题
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     If you go to a fast food restaurant, you will probably see a lot of teenagers. Today, many teenagers

are overweight, and some of this is because of their bad eating habits . Most teenagers love food with

a lot of fat, oil, salt, and sugar. People often call this kind of food "junk food".

      But bad eating habits go beyond fast food. We find many teenagers eat unhealthily. Some don't have

breakfast before they go to school. During the day, some don't have a proper meal for lunch. In a recent

survey at one school, scientists found that over two-thirds of the students didn't follow a healthy diet. They didn't like vegetables, and many of  them didn't like to eat fruits. They would rather eat food with a lot of

salt, sugar, or fat.

     Parents today also worry about their children's diet. Some doctors give the following advice:

     Teenagers shouldn't eat too much junk food.

     Teenagers shouldn't eat food with too much salt. Salt can cause high blood pressure in the future.

     Teenagers should eat food with less fat, oil, and sugar.

     Teenagers need to eat some fruits and vegetables every day. Fruits and vegetables are rich in vitamins

and have little fat.

     Teenagers need to drink more milk. Milk will help their bones grow.

     Teenagers need to eat breakfast every day. This is good for their body and mind.

1. "Junk food" contains a lot of ____________.

A. milk an sugar                            

B. fruits and sugar

C. vegetables and salt                        

D. fat, oil, salt and sugar

2. In a recent survey at one school, scientists found many students liked _________.

A. vegetables    

B. unhealthy food    

C. fruits      

D. healthy food

3. In this passage, doctors think that teenagers should eat more _____________.

A. food with no vitamins    

B. fat and sugar  

C. vegetables and fruits    

D. salt and oil

4. The passage talks mainly about ______________.

A. bad habits      

B. junk food    

C. unhealthy food    

D. advice on healthy eating