问题 单项选择题

局麻药中毒时,发生惊厥的主要机制

A.大脑皮质兴奋
B.兴奋大脑兴奋性通路
C.抑制大脑抑制性通路
D.兴奋交感神经系统
E.抑制副交感神经系统

答案

参考答案:C

解析:局麻药中毒引起的惊厥是由于选择性作用于边缘系统、海马和杏仁核,以及大脑皮层的下行抑制性通路,使下行抑制系统的抑制作用减弱,使大脑皮层和皮层下的易化神经元的释放不遇阻抗,故肌牵张反射亢进而发生惊厥。

阅读理解

阅读理解

       Every year there is the Spring Festival in China. Usually it is in January(一月)or February(二月). It

is the most important festival in China. So before it comes, everyone has to prepare things. They buy pork, beef, chicken, fruit and many other things. And they often make a special(特别的) kind of food called

"dumplings". It means "come together" in Chinese. On the day before the festival, parents buy new clothes

for their children and children also buy presents for their parents. On Spring Festival's Eve, all the family

members come back to their home. This is a happy moment. They sing, dance and play cards. Others get

the dinner ready. When they enjoy the meal, they give each other the best wishes for the coming year.

They all have a good time.

1.        is the most important festival in China?  

A. Mid-autumn Day                

B. The Spring Festival  

C. Children's Day                  

D. Teachers' Day

2. The Chinese usually have their Spring Festival in        .  

A. January or February  

B. January or March    

C. summer        

D. autumn

3. What's the special kind of food for the Spring Festival in China?  

A. Cakes.            

B. Pudding.          

C. Hotdog        

D. Dumplings.

4. The food "dumplings" means "       ". 

A. be delicious        

B. be hungry          

C. come together  

D. be happy

5. When they are having dinner on Spring Festival's Eve, the Chinese    .

A. eat Candy                     

B. eat moon cakes

C. never drink                    

D. give each other the best wishes

多项选择题