问题 单项选择题

13岁女孩,10岁前无症状,后自觉体力不如同学,剧烈运动后胸闷气短。此次因高热1天门诊收住院。查体:心前区未触及震颤,胸骨左缘第2~3肋间2/6级收缩期喷射性杂音,第2心音固定分裂,肺动脉第2心音稍增强。

此患儿心脏杂音形成最直接的血液动力学变化是下列哪一种

A.左心容量负荷增多

B.经主动脉瓣血流量减少

C.右心压力负荷增加

D.血液经房间隔缺损自左心房流入右心房

E.经肺动脉瓣血流量增多

答案

参考答案:E

解析:由于右心室增大,大量的血流通过正常肺动脉瓣时(形成相对狭窄)在左第2肋间近胸骨旁可闻及2~3级喷射性收缩期杂音。

阅读理解

阅读理解。

  American schools begin in September after a long summer holiday. There

are two terms in a school year, the first term is from September to January, and

the second is from February to June. Most American children begin to go to

school when they are five years old. Most children are seventeen or eighteen

years old when they finish high school. High school students study only four or

five subjects each term. They usually go to the same class every day, and they

have homework for every class. After class they do many interesting things.

  High school students take only five or six subjects each term. They usually

go to the same class every day,and they have homework for every class.After

class,they do a lot of interesting things.

  After high school, many students go to college. They can go to a small one

or a large one. They usually have to give a lot of money. So many college

students work after class to get the money for their studies.

1. Most American children go to school at the age of _____.

A. eight    

B. seven    

C. six      

D. five

2. High school students _____ after class.

A. do a lot of homework  

B. do some housework for their parents

C. do many interesting things    

D. do some shopping

3. After high school, many students go to_____.

A. work in a college    

B. college  

C. make more money    

D. cities or towns

4. In order to _____, many college students work after school.

A. get the money for their studies      

B. help other people

C. help their parents  

D. learn some new things

5. From this passage we can know in American, a summer holiday begins in

_____.

A. July              

B. January

C. September          

D. February

解答题