题目内容
16.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.
39.What is the main idea of the passage?C
A.How to detect nuclear radiation.
B.How radiation kill a man.
C.The mystery about nuclear radiation.
D.Serious damage caused by nuclear radiation.
40.Which of the following statements is true?A
A.Nuclear radiation can cause cancer to human beings.
B.Nuclear radiation can be safe to human beings if its level is low.
C.Nuclear radiation can be detected by human senses.
D.Nuclear radiation is just like common radio waves.
41.What is not the reason why nuclear radiation has a certain mystery?C
A.The hurt cells can stay in the body many years and then grow into cancer.
B.It can do harm to a person while the victim isn't aware the damage
has occurred.
C.Nuclear radiation can kill a person very easily.
D.Radiation can seldom kill a person immediately.
42.If a human being is hit by nuclear radiation,he mayD.
A.die of cancer after many years B.die immediately
C.have a child who may be born weak D.all of the above.
分析 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.
解答 39.C.主旨大意题.通读全文,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;故选C.
40.A.细节理解题.由第三段But if the few cells are only damaged,and if they reproduce themselves,you may be in trouble.They can grow into cancer可知.核辐射可以致癌,故选A.
41.C.细节理解题.根据最后一段This is another reason for some of the mystery about nuclear radiation可知核辐射的神秘在于受伤的细胞可以留在体内多年,然后成长为癌症,它可以伤害一个人,而受害者不知道损坏已经发生;辐射很少能立即杀死一个人;故选C.
42.D.细节理解题.由第四段Or a child can be born weak as a result of radiation absorbed by its grandparents可知经过多年的癌症才死亡;我们的孩子可能天生就虚弱;故选D.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
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