2019年PETS二级阅读理解练习题（3）

Nuclear power’s danger to health, safety, and even life itself can be summed up in one word: radiation.

Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can’t be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can’t detect them, sense them, without a radio receiver. Similarly, we can’t sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They can grow into cancer. Sometimes this does not show up for many years.

This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated(辐射)and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents.

Radiation can hurt us. We must know the truth.

小题1:Which of the following statements is true?A.Nuclear radiation is just like common radio waves.

B.Nuclear radiation can cause cancer to human beings.

C.Nuclear radiation can be detected by human senses.

D.Nuclear radiation can be safe to human beings if its level is low.

小题2:How can nuclear radiation kill an animal?A.By damaging its heart.

B.By killing a few cells.

C.By hitting any place in its body.

D.By killing many cells in important organs.

小题3:If a human being is hit by nuclear radiation, he may __________.A.die of cancer after many years

B.die immediately

C.have a child who may be born weak

D.all of the above

　　参考答案及解析

小题1:B

小题2:D

小题3:D

文章大意：本文向我们介绍了核能对我们健康的危害。核能对人类的健康、安全乃至生命所造成的危害可用一个单词加以概括：辐射。

小题1:B　细节理解题。由第二段第一句话可知，C项错误;由第二段最后一句话“But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. ”可知，核辐射对人类健康有害，它和一般的微波不一样，所以A、D项错误;由第三段倒数第二句话可知，B项正确。

小题2:D　推理判断题。由第三段第一句话“At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs.”可知，D项正确。

小题3:D　细节理解题。由第四段倒数后两句话可知，A、C项正确;由第三段第一句话可知，A项正确。所以选D项。