问题 单项选择题 A1/A2型题

可引起第二心音A增强的是()

A.动脉粥样硬化

B.主动脉瓣狭窄

C.主动脉瓣关闭不全

D.肺动脉高压

E.左心功能不全

答案

参考答案:A

解析:第二心音强度与循环阻力的大小、血压的高低和半月瓣的解剖改变相关,体循环阻力高或血流量增多时S增强。

阅读理解

阅读理解。

     Mike was starting the fourth grade in the autumn. He felt that he was old enough to ride a bike to school

like other kids. But there were two problems! The first was that he didn't know if his parents would let him

ride a bike to school. The second and the bigger of the two problems was that he didn't have a bike, because

he and his parents had just moved to the town this summer.

     Mike started to get over his problems. First, he asked his parents if they would let him ride a bike to school

in the autumn. To his surprise, they said, "Sure, Mike, you are old enough, but you don't have a bike!" Mike

began to think about how to solve the problem. Finally, he thought of an idea. He asked the neighbors if he

could mow (割) their lawns (草坪) to earn money to buy a bike. For all of them needed to mow their lawns,

they told Mike that would be fine, if his parents agreed. Mike's parents were pleased that he found a way to

buy a bike himself. They agreed and taught Mike how to mow the lawn properly. Finally, he had enough money

to buy his bike. He bought a beautiful black and red mountain bike.

1. Mike wanted to _____.

A. begin to study in autumn

B. ride a bike to school

C. mows the lawn for his family

2. What was the bigger problem for Mike?

A. He didn't have a bike.

B. He was not old enough to ride a bike.

C. His parents didn't want him to ride a bike.

3. What is the right order of the following events according to the article?

    ① Mike had two problems.

    ② Mike bought a bike.

    ③ Mike thought he was never too young to ride a bike.

    ④ Mike mowed the lawns for his neighbors.

A.①②③④  

B.②①④③  

C.③①④②

4. Which one is WRONG according to the passage?

A. Mike's family was new on his block (街区).

B. Mike was a gardening worker.

C. Mike bought a black and red bike.

5. Which is the best title?

A. Mike's kind neighbors.

B. Mike's new bike.

C. How to earn money.

单项选择题