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

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

admin2005-06-26  154
问题     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 levels 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 a result of radiation absorbed by its grandparents.
    Radiation can hurt us. We must know the truth.
Radiation can hurt us in the way that it can______.
选项 A、kill large numbers of cells in main organs so as to cause death immediately
B、damage cells which may grow into cancer years later
C、affect the healthy grow of our offspring
D、all of the above
答案D
解析 文章第三段第一句话，“当核辐射处于高强度时，它通过杀死重要器官内的大量细胞，使动物和人立刻死亡”。所以A项正确。第四段提到“一个人被辐射后可能感觉正常，结果在5年、10年或20年后死于癌症”。可见，核辐射可能伤害人体的一些细胞，多年以后引发癌症。所以B正确。第四段中同样提到了核辐射对后代的影响：一个小孩可能生来就身体弱或是容易患重病，是因为他们的祖父母吸收了辐射。所以C项也正确。因此本题的正确答案应该是D。
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