题目
题型：不详难度：来源：
At very high levels, radiation can kill an animal or human being at once by killing plenty of cells in important organs(器官). 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 when they are killed at once. 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 an unusual 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 knowledge of the person at the time that damage has occurred. A person can be irradiated(放射治疗) and feel fine, then die of cancer five, ten, or twenty years later as a result. A child can be born weak or easy to get serious illness as a result of radiation absorbed by its grandparents.
小题1:According to the passage, the danger of nuclear power lies in .
| A．nuclear mystery | B．radiation detection |
| C．radiation level | D．nuclear radiation |
| A．when it kills a few cells |
| B．because the killed cells can’t be replaced |
| C．if it damages a few cells |
| D．unless the damaged cells can reproduce themselves |
| A．Radiation can hurt us. | B．Radiation is a subject scientists work on. |
| C．Radiation is a mystery. | D．Radiation is the source of cancer. |
答案
小题1:D
小题1:C
小题1:A
解析
核心考点
试题【Nuclear radiation （核辐射）has a certain mystery, partly because it cannot be detect】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
There’s a catch, of course. You have to live near enough to a major city to get broadband Internet. If you don’t, it’s slow dial-up access for you. And for those living really far out, there may be no Internet access at all.
Technology experts often talk about the “last mile” problem, which refers to the difficulty of bringing Internet access to remote locations. In cities and suburbs, it’s relatively easy to provide access for everyone. It is much more difficult to deliver access to those living far from cities, especially in de
veloping countries. Internet service providers, for their part, have been reluctant to provide access to sparsely(稀疏地) populated areas. The handful of Internet users they would reach wouldn’t cover the expense.But every year, technological advancements allow of more and more Internet users. Most broadband connections today run over existing cable TV and telephone lines although these technologies aren’t available everywhere. Some companies have delivered the Internet over standard power lines. Advancements in cheaper, more efficient fiber optics cables(光纤电缆) promise to bring extremely fast Internet connections to more users.
Still, the “last mile” problem remains hard to deal with. There will always be somewhere that doesn’t have an affordable broadband connection. But someday that might not matter. If the rapid progress in cell phone technology is any indication(迹象), it may not be too long before an Internet connection simply follows you wherever you go.
小题1:The underlined part “ a catch” (in Paragraph 2) probably means “________”.
| A．a rare challenge | B．a desirable plan |
| C．an efficient device | D．a hidden problem |
| A．Internet connection has not been popular in most cities. |
| B．Internet service providers care about rural customers. |
| C．Computer is popular in developing countries. |
| D．It is hard to bring Internet access to users in remote areas. |
| A．make TV and telephone available everywhere |
| B．bring great change to people’s everyday life |
| C．make it possible for more people to use the Internet |
| D．bring faster Internet connections to users |
| A．The broadband connection’s getting faster. |
| B．More and more Internet users. |
| C．More and more Internet connections. |
| D．The rapid progress in cell phone technology. |
In this class a little German boy, who does not speak 28 ，cried all the time at first and now cries occasionally.
The Monday of the second week the little fellow just cried and cried. He was sitting 29 Matthew. I thought Matthew was going to start 30 and join in. I stood by and watched, ready for the rescue. Matthew kept turning around and 31 the boy. Then he reached his hand back and 32 him on the leg. He was comforting the boy! Later Matthew was playing with a 33 and the boy with blocks. Actually he was just standing by and crying. Matthew drove his truck over to the blocks, 34 it, picked up a few of the blocks and started handing them to 35 . They then together started 36 towers on the table and the little boy 37 crying．It seemed 38 Matthew knew what the little guy needed．Here was the little guy，who can’t speak English，and Matthew，who 39 playing together，like they were best 40 .
One of the days when I stayed，they were at lunch and Matthew was 41 at the table. I pulled up a chair to sit next to him．He smiled，then grabbed his book bag and took off running 42 the cafeteria．I took off after him．When we reached the wall he just giggled (咯咯笑)，turned around and looked at me． I bent 43 to blame him for leaving his seat and running. He suddenly 44 a big wet kiss right on my cheek and smiled at me．All I could do was to take his hand and 45 him back to his seat．Then I turned my back and couldn’t help laughing.
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Time passes very quickly. Some students say they don’t have 26time to review their lessons. It is 27 they don’t know how to make use of their time. They waste it in going to theatres or playing, and 28 other useless things. Why do we study everyday? Why do we work? Why do most people 29 take buses instead of walking? The answer is very 30 .We wish to save time because time is31.
Today we are living in the 21st century. We 32 time as life. When a person dies, his life ends. Since life is short, we must 33 our time and energy to our study so that we 34 be able to work and live well in the future. Laziness is the 35 of time, for it not only brings us 36, but also does other 37 to us. If it is necessary for us to do our work today, 38 we do it today and not 39 it until tomorrow. Remember that time is much more 40.
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When Marc Yu was only two years old，he began to play the piano. After a year, he started learning pieces by Beethoven. Now he’s a world-famous concert pianist at age eight. He learns newer and more difficult pieces with ease and can identify any note he hears. He seems to be specially designed for music. In Born Genius, National Geographic looks at the science behind child prodigies （神童） to explain why some children seem to be born without limits.
Geniuses didn’t come naturally to Tommy McHugh. His came only after he nearly died from bleeding in his brain. After recovering, McHugh’s head was filled with new thoughts and picture. So, he began to express them in the form of poetry and art. Now, he’s a seemingly unstoppable creative machine. Suffers of brain injury have shown that great mental ability can sometimes come from damage or disease. Accidental Genius explores this puzzling relationship.
Can normal people be trained to be geniuses? Susan Polger has shown no sign of extraordinary intelligence. Yet, during her childhood, she studied thousands of chess patterns and learned to recognize them immediately. As a result, she was able to beat skilled adult players by age 10 and can now play up to five games at the same time without even seeing the boards. Make Me a Genius examines what is takes to turn an ordinary brain into that of a genius.
If becoming a genius were easy, we’d all be done. Yet, there is much more to super intelligence than simply being born lucky. Learn more about amazing brains this month on National Geographic’s My Brilliant Brain.
小题1: In paragraph 2, Marc Yu’s story tells us_________________.
| A．a child prodigy can work easier than others. |
| B．a child prodigy is trained by family. |
| C．a child prodigy has an unbelievable listening skill. |
| D．a child prodigy always practise his skills. |
| A．Tommy McHugh could not be called a genius. |
| B．Tommy McHugh became a genius when he was young. |
| C．Tommy McHugh was a robot but not a real human being. |
| D．Tommy McHugh became a genius after a sudden accident. |
| A．show how people can be geniuses. | B．show becoming a genius is easy. |
| C．show geniuses are common. | D．show people know how to explain geniuses. |
| A．a report | B．a novel | C．a TV program | D．a newspaper |
Between 2 and 3 pounds of wonder，it controls everything we say，do or think，who we are and what we care about. The way we walk or laugh or figure out things. What we like and the talents we possess. How we see and talk and run and jump and process our food.
The brain uses 20 percent of our body"s oxygen and 20 percent of its blood. Somewhere within its protein，fat, 100,000 miles of blood vessels and 100 billion nerve cells，it helps us remember where we put our gym shoes. Change our temperature so we don"t die because of the heat or cold. Speed us up or slow us down. Help us choose between orange juice or orangeflavored drinks.
Its intricacies(复杂性)are stunning，far beyond anything most of us can imagine. To keep this work of art as polished(有光泽的) as possible we need to eat right，exercise and keep mentally stimulated(刺激)．
Good nutrition helps brain cells communicate with each other. Exercise stimulates a hormone(荷尔蒙)in our brain that improves memory. Mental stimulation keeps you sharp even as you age.
“It"s very important that we tell people to be physically active and mentally active，” said neurologist Malcolm Stewart.
“People cannot stop aging，but you"re able to reduce the damage；you"re able to keep the function up.”
Following are Dr.Stewart"s advice for improving brain health：
| Nutrition | Avoid fast food. Follow the old adage(格言，谚语)：For breakfast，eat like a king；for lunch，like a queen；for supper，like a beggar. |
| Exercise | Do a combination of stretching aerobic and musclestrengthening every day. |
| Mental games | Try to have a sense of hope about the future. Do puzzles. Listen to music. Reach out to others to make their lives better. |
| A．inform us how the brain works |
| B．give us advice on how to keep the brain healthy |
| C．tell us that the brain plays an important role in our lives |
| D．show how special the brain is to us |
| A．interesting | B．strange | C．significant | D．amazing |
| A．keeps our mind sharp |
| B．helps improve our memory |
| C．gives our brain a rest |
| D．is good for brain cells communicating with each other |
| A．eating a good lunch | B．doing puzzles |
| C．eating a large supper | D．taking aerobic exercise |
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