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

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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.
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 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
comnpletely 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.
There is another reason for the mystery of nuclear radiation.Serious damage can be done without the
victim being aware at the time that damage occurs. 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 a result
of radiation absorbed by its grandparents.
Radiation can hurt us.We must know the truth.

选项 The underlined word"significant"in Paragraph 3 most probably means_______________. A: fatal B:meaningful C:remarkable D:harmful

答案 A

解析由第一段内容可知核能的危险在于其辐射性。
由第三段的第二句和该段最后四句可知，即使很少的细胞遭核辐射损坏（未被完全杀死），也会造成严重的后果。
该词是对本句中if条件句所述情况所造成的损害的评述，而其后两句是对该句的补充说明，由这两句所述的“……你的身体会用健康的细胞取代坏死的细胞”可知，情况并不严重，故选A。 fatal意为“致命的，灾难性的”,significant意为“重大的，影响深远的”。
由第三段第一句、第三段最后四句和第四段最后一句可知，D项为正确答案。
文章叙述了核辐射危害的严重性、潜伏性和长期性，由此可知，再怎么强调防辐射都不为过。第三篇本文主要介绍了一种预侧山体滑坡的设备。

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