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

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

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问题     Nuclear power’s danger to health, safety, and even to 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 cannot be seen or heard, or touched or tasted, even though it is all around us. There are other things like that. Radio waves are all around us but we cannot detect them, sense them, without a radio receiver.  Similarly, we cannot sense radioactivity without a radio detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other things.
    At very high levels, radiation can kill an animal or human being outfight 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 hurt anything important, the damage may not be significant. This is the case when only a few 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 radiated and feel fine, then die of cancer five, ten or twenty years later as a result.
    Radiation can hurt us. We must know the troth.  
We can infer from the fourth paragraph that ______.
选项 A、a person can receive radiation without knowing it
B、a radiated mother may give birth to a weak baby
C、radiation received by a grandparent can affect a grandson
D、some illnesses are caused by unobserved radiation
答案D
解析 依据第四段，我们可以知道：有时人们还没有察觉到，就已经受到了辐射。他们虽然受到了辐射，但感觉良好。然而5年，10年甚至20年后辐射所产生的危害才会发生。由此可见，这里D项正确。
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