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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  110
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.
Which of the following can be best inferred from the passage?
选项 A、The importance of protection from radiation cannot be over-emphasized.
B、The mystery about radiation remains unsolved.
C、Cancer is mainly caused by radiation.
D、Radiation can hurt those who are not aware of its danger.
答案A
解析 根据文章内容可知：作者首先讲了核辐射的神秘性，即甚至它可能就在我们周围也不能被看到、听到、触摸到、闻到，紧接着作者讲到了它的危害性。可见，不能因为我们感觉不到核辐射，就认为强调人们要免受核辐射是不现实的。所以A项所说的“保护人们免受核辐射的重要性怎么强调都不过分”与文章的意思相符。在文中作者提到了人们之所以认为核辐射神秘的两个原因，可见人们对核辐射的神秘已经有所了解了，所以B项不对。文章讲到了辐射会造成癌症，但引起癌症的原因是多方面的，文中并没有说癌症主要是因辐射引起的，所以C项也不对。文中讲到“在辐射发生损害时，受害者不能意识到自己遭受到严重伤害”，所以无论有没有意识到辐射危险性的人都可能受到了辐射的伤害，所以D项也不对。因此本题的正确答案为A。
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