t="" be="" seen="" or="" heard,="" touched="" tasted,="" even="" though="" it="" may="" all="" around="" us.="" there="" are="" other="" things="" like="" that.="" for="" example,="" radio="" waves="" us="" but="" we="" can’t="" detect="" them,="" sense="" them="" without="" a="" receiver.="" similarly,="" radioactivity="" radiation="" detector.="" unlike="" common="" waves,="" nuclear="" is="" not="" harmless="" to="" human="" beings="" and="" 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 in 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.1.According to the passage, the danger of nuclear power lies in（ ）.2.Radiation can cause serious consequences even at the lowest level （ ）.3.Radiation can hurt us in the way that it can （ ）.4.Which of the following can be best inferred from the passage?'>

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 in 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.1.According to the passage, the danger of nuclear power lies in（ ）.2.Radiation can cause serious consequences even at the lowest level （ ）.3.Radiation can hurt us in the way that it can （ ）.4.Which of the following can be best inferred from the passage?

A.nuclear mystery B.radiation detection C.radiation level D.nuclear radiation
问题2：
A.when it kills few cells B.if it damages the few cells C.though the damaged cells can repair themselves D.unless the damaged cells can reproduce themselves
问题3：
A.kill large numbers of cells in main organs so as to cause