安全教育学习是提高员工安全防范意识的重要措施。“百日安全活动”开展以来，保卫部从自身着手对本部门所有员工开展集中安全教育培训课时跟踪练(一) Introduction & Reading Pre reading.阅读理解ANuclear powers 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 cant 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 cant detect them, sense them, without a radio receiver. Similarly, we cant 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 immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels 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：文章介绍了核辐射对人造成的危害是巨大的，它可以立即杀死一个人，也可能会潜伏多年再发生癌变，甚至可能遗传给后代。1What is the main idea of the passage?AHow to detect nuclear radiation.BHow radiation kills a man.CThe mystery about nuclear radiation.DSerious damage caused by nuclear radiation.解析：选C主旨大意题。根据第一、二段可知，核能的危害可以归结为辐射，核辐射有一种神秘感，主要是因为它不能被人类感知。因此，文章主要讲的是核辐射的秘密。故选C。2What is NOT the reason why nuclear radiation has a certain mystery?AThe hurt cells can stay in the body many years and then grow into cancer.BIt can do harm to a person while the victim isnt aware the damage has occurred.CNuclear radiation can kill a person very easily.DRadiation can seldom kill a person immediately.解析：选D推理判断题。根据第三段“At very high levels .in vital organs.”可知，如果辐射强度很大，核辐射可以立即将人或动物杀死。3If a human being is hit by nuclear radiation, he may _.Adie of cancer after many yearsBdie immediatelyChave a child who may be born weakDall of the above解析：选D细节理解题。根据第三段的内容和第四段最后一句可知，核辐射可能立即杀死一个人，也可能会潜伏多年再发生癌变，核辐射可能遗传给后代，A、B、C都正确，故选D。BWhen I was a child, I was a “genius” the kind you sometimes see profiled on the local news. I started reading at 2. I could multiply twodigit numbers in my head when I was 5. In third grade, I commuted to the local junior high to take geometry. Kids on the playground would sometimes test me by asking what a million times a million was and were delighted when I knew the answer.Many advocates for gifted education are similarly delighted by kids like me, seeing us as a kind of natural resource, one we risk squandering as surely as we do fossil fuels. “These are the people who are going to figure out all the riddles，” the psychologist David Lubinski said. “But they are not given a lot of opportunities in schools that are designed for typically developing kids.”But heres the thing: Talent isnt a number. Since were only 1 in 10,000 of the U. S. population, that still leaves 99% of scientific advances to be made by all those other kids who didnt get an early ticket to the genius club. Most child prodigies are highly successful but most highly successful people werent child prodigies.One of the most painful aspects of teaching mathematics is seeing my students damaged by the respect of the genius. That tells students that its not worth doing math unless youre the best at math because those special few are the only ones whose contributions really count. We dont treat any other subject that way. But I see promising young mathematicians quit every year because someone in their range of vision is “ahead” of them.Terry Tao, a winner of the Fields Medal, once wrote：“I find the reality of mathematical research today in which progress is obtained naturally and gradually as a result of hard work, directed by intuition, literature, and a bit of luck to be far more satisfying than the romantic image that I had as a student of mathematics being advanced primarily by the magic inspirations of some rare breed of geniuses”Genius is a thing that happens, not a kind of person.语篇解读：本文是一篇议论文。主要讨论了关于儿童天才的问题，说明了许多进步是辛勤努力的结果，而不仅仅是天才造成的。4The underlined word “squandering” may mean _.AwastingBusingCsharing Dproviding解析：选A词义猜测题。结合画线