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  3. 共用题干 第二篇Nuclear Power and Its DangerNuclear power's danger to health,safety...

共用题干 第二篇Nuclear Power and Its DangerNuclear power's danger to health,safety...

admin2020-12-24  21
问题 共用题干
第二篇

Nuclear Power and Its Danger

Nuclear power's danger to health,safety,and even life itself can be summed up in one word:radiation.
There is a certain mystery about nuclear radiation,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 outright by killing masses of cells in vital organs.But even the lowest level of radiation can do serious damage.There is no level of radiation that is completely safe.If the radiation does not hit anything important,the damage may not be significant. This is the case when only a few cells are hit,and if they are killed outright,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 reproduce themselves in a deformed way.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 and feel fine,then die of cancer five,ten,or twenty years later as a result. Or a child can be born weak or liable to serious illness as result of radiation absorbed by his grandparents.
Radiation can hurt us.We must know the truth.
选项 Radiation can cause serious consequences even at the lowest level_______.
A:when it kills a few cells
B:if it damages a few cells
C:though the damaged cells can repair themselves
D:if the damaged cells reproduce themselves
答案D
解析第一段就明确指出核能的危险在于它的核辐射。
第三段提到即使很微量的辐射也会带来严重的后果，主要因为受损伤的细胞会以畸形的方式自我复制，进而转变为癌症。
significant此处指“要紧的，致命的”所以选A。
略
文章第二段和第四段分别提到了不同的reasons for some of the mystery about nuclear radiation，由此可以推断，核辐射仍然是一个未解之谜。
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