同等学力英语每日一练2014-3-2——学苑教育.pdfVIP

网址： 同等学力英语每日一练（2014-3-2 2014年参加同等学力的考生们，学苑教育献上同等学力英语每日一练，我们将每天发布1--5 道习题，帮助大家夯实基础。大家可随时关注学苑教育同等学力考试频道，我们将第一时间 公布相关考试信息。 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， radiowaves areallaroundusbutwe can’tdetectthem，sensethem，without aradio 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 cell 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 doesnothitanything important，thedamagemay notbe significant.This isthecase whenonlyafewcellsarehit，andiftheyarekilledoutright.Yourbodywillreplace the deadcellswith healthy ones.But ifthefew cells are only damaged，and ifthey reproducethemselves，youmaybe introuble.Theyreproducethemselvesinadeformed way. They can grow into cancer. Sometimes this does not show up for many years. This isanother reason for someof themystery aboutnuclear radiation. Serious 1 网址： damagecanbedonewithoutthevictimbeingawareatthetimethatdamagehasoccurred. 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. 1.According to the passage，t