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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  64
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 cause serious consequences even at the lowest level______.
选项 A、when it kills few cells
B、if it damages few cells
C、though the damaged cells can repair themselves
D、unless the damaged cells can reproduce themselves
答案B
解析 通过阅读第三段，我们可知在本段中作者讲到，高强度的核辐射能够立即杀死人或动物，最低强度的辐射也能造成严重的后果。任何强度的辐射都不可能绝对安全。如果立即杀死少量的细胞时，身体会有健康的细胞去代替，而损害的细胞有可能会畸形再生演变成癌。可见，A项不对，杀死的细胞会有健康的新细胞去代替，不会造成严重后果。文章并没有说受伤的细胞会自我修复，只是假设它能自我恢复。所以C项不对。根据第三段的内容我们也可以推知：只要受损害的细胞不再生是不会有任何严重后果的。所以D项不对。因此本题的正确答案应为B，它伤害很少的细胞有可能会引发癌症。
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