问题 单项选择题

正常肺静脉血流的多普勒频谱有什么特点

A.收缩期、舒张期各有一负向的峰 

B.只有舒张期一个正向的尖峰波 

C.收缩期、舒张期各有一正向的峰,后者大于前者 

D.舒张期呈双峰、均正向 

E.收缩期呈双峰,均为负向,无舒张期血流 

答案

参考答案:A

阅读理解

It’s duty of every man to work. The life of a lazy man is of no use to himself and to others. If the man is too lazy to work, he will usually become a not useful man. Everyone, when he is young, should learn some useful work.

But it’s not enough for a man to learn some kind of work. He should put his heart and soul (精力) into his work, and not waste his free time. “Work while you work and play while you play” is as good rule for young people as old.

There is no better to help to diligence than the habit of early rising, and this, just like all other good habits, is most easily formed in youth (青年). There is an English say “Lost time never returns.” This means that everybody must be diligent, and make good use of time. One must study hard when one is young so that one can make great progress, succeed in life and become useful to one’s country. So we can say that diligence is the mother of success.

小题1:The underlined word “diligence” in the third paragraph means “ ________” in Chinese.

A.惜时

B.勤奋

C.失败

D.智慧小题2:If a man wants to be of useful himself and to the people, he should __________.

A.learn some useful work

B.do something in his free time

C.put his heart and soul in everything

D.try his best to work without rest小题3:In order to learn to be diligent, it’s very important for young people to learn to ________.

A.work while you work and play while you play

B.work all the time without playing

C.form the habit of getting up early

D.learn some good subjects小题4:One will be successful in life if he _____________ when he is young.

A.spend more time learning

B.is diligent in his study

C.loves his school

D.gets up early小题5:Which of the following may be the best title for this passage?

A.Lazy boy can learn to be diligent

B.Young people should rise early

C.Diligence, the mother of success

D.Lost time never returns

单项选择题