问题 单项选择题

阻塞性肺气肿支气管炎型的临床表现,下列哪项是正确的()。

A.发病年龄较轻

B.多无发绀

C.喘息明显,多呈持续性

D.X线胸部X线片呈肺纹理减少

E.静息时PaO2轻度降低

答案

参考答案:A

解析:阻塞性肺气肿支气管型的临床特点主要为:发病年龄较轻;体型多肥胖,有发绀;咳嗽较重;喘气较轻,常在并发感染时加重;呼吸音正常或减低,湿啰音较多;X线胸部X线片示肺气肿征不明显,肺纹理增加,增粗;肺功能检测显示肺总量正常或轻度增加,残气量中度增加,FEV1降低,肺顺应性在静态时接近正常,但动态时很低;血气检查静息时PaO2显著降低,在运动时则更低,但PaCO2常明显升高;此外,此型患者并发肺心病伴心力衰竭者较多。所以本题仅选项A所述是正确的。

选择题
阅读理解

阅读理解

阅读下列短文,从每题所给的四个选项中,选出最佳选项。

      Albert Einstein (1879 ~ 1955) was one of the greatest and most original scientific thinkers of all time.

      Born of Jewish parents at Ulm in Germany, he completed his education in Switzerland and got his Ph.D at the University of Zurich. He went to live in the United States in 1933 because of the rise of Nazism(纳粹) in Germany and Hitler's persecution(迫害) of the Jews.

       In 1905, while still at Zurich, he published his Special Theory of Relativity,which was based on things everyone may have noticed. If two trains are standing alongside each other and one train starts to move,a

person sitting in the train may wonder whether his own train is moving or the other is moving, and before

he finds out what is happening,he can see that one train is moving relatively to the other. From this and

also from other more complicated facts, Einstein came to the conclusion that all motion is relative and that

there are really no such things as absolute(绝对) motion. Some of the other conclusions he drew are that

nothing can go faster than light,and that if something such as a ruler was moving faster and faster it would

seem to get shorter and shorter as its speed was near the speed of light. By 1915,Einstein had made

known his General Theory of Relativity. He also improved on Newton's theory of gravity. Most of his

theories have been tested and found to be true though some may sound strange. For his  important work

he was awarded the 1921 Nobel Prize for Physics.

1. In 1933,Einstein went to live in the United States  because     ___.

A. he loved the USA more than his own country

B. he had got some friends there with whom he  could work together

C. he wanted to live quietly in the USA

D. he could no longer work in Germany when Hitler came into power

2. Einstein published  his Special Theory of Relativity  when he was           .

A. in the United States

B. in Ulm,Cermany after he got his Ph.D

C. still in Switzerland at the age of twenty-six

D. still at the University of Zurich at the age of thirty-six.

3. One of the conclusions drawn by Einstein is that       .

A. places go faster than trains and buses

B. people couldn't run as fast as vehicles

C. light goes the fastest of all the things

D. two trains can go in different directions

4. Einstein added that if something such as a ruler was moving it would seem to get shorter and

    shorter        .

A. because the ruler itself was short

B. when it was moving faster and faster

C. because we can't see it clearly

D. because the ruler was broken into pieces

5. Einstein was world-famous for his ___   .

A. Special Theory of Relativity

B. Ceneral Theory of Relativity

C. improving on Newton's theory of gravity

D. all of the above