At very high levels, radiation can kill an animal or human being immediately 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 serious.This is the case when only a few cells are hit, and if they are killed immediately, 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 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(辐射)and feel fine, then die for cancer five, ten, or twenty years later as a result.Or a child can be born weak as a result of radiation absorbed by its grandparents.

　　Radiation can hurt us.We must know the truth.

　　【语篇解读】　核能源对健康、安全、甚至是生命本身的危害都能用一个词来概括：辐射。

　　1．What is the most dangerous factor of nuclear power?

　　A．Amount.

　　B．Quantity.

　　C．Radiation.

　　D．Place.

　　答案　C　[由第一段，可知C正确。]

　　2．Which of the following statements is TRUE?

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