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(輻射)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 本文向我們介紹了核能對我們健康的危害.核能對人類的健康、安全乃至生命所造成的危害可用一個單詞加以概括:輻射.
解答 39.C.主旨大意題.通讀全文,本文向我們介紹了核能對我們健康的危害.核能對人類的健康、安全乃至生命所造成的危害;故選C.
40.A.細節(jié)理解題.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.核輻射可以致癌,故選A.
41.C.細節(jié)理解題.根據(jù)最后一段This is another reason for some of the mystery about nuclear radiation可知核輻射的神秘在于受傷的細胞可以留在體內多年,然后成長為癌癥,它可以傷害一個人,而受害者不知道損壞已經發(fā)生;輻射很少能立即殺死一個人;故選C.
42.D.細節(jié)理解題.由第四段Or a child can be born weak as a result of radiation absorbed by its grandparents可知經過多年的癌癥才死亡;我們的孩子可能天生就虛弱;故選D.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.