问题 选择题

如图,下列预防传染病流行的措施中,属于保护易感人群的是(  )

A.对病人隔离治疗

B.预防接种

C.讲究个人卫生

D.对饮用水进行消毒

答案

答案:B

题目分析:A、病人是能够散播病原体的人属于传染源,因此对病人隔离治疗属于控制传染源;

B、疫苗进入人体能刺激淋巴细胞产生抗体,从而提高了免疫能力避免感染,因此预防接种保护易感人群;

C、讲究个人卫生主要是减少病原体与人的接触,因此讲究个人卫生属于切断传播途径;

D、对饮用水进行消毒,是防止病原体通过水进行传播,因此对饮用水进行消毒属于切断传播途径.

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

名词解释