Nuclear radiation （核辐射）has a certain mystery, partly because it cannot be detected （探测）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 or 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 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.According to the passage, the danger of nuclear power lies in .
| A．nuclear mystery | B．radiation detection |
| C．radiation level | D．nuclear radiation |
Radiation can lead to serious trouble even at the lowest level .
| 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 |
What does the author want to tell us?
| 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. |
Did you ever look up at the moon and think you saw a man’s face there? When the moon is round and full, the shadows(影子) of the moon mountains and the lines of the moon valleys sometimes seem to show a giant nose and mouth and eyes. At least, some people think so.
If there were a man on the moon—instead of mountains and valleys that just look like the face of a man—what would he be like?
He would not be like anyone you know. He would not be like anyone anybody knows.
If the man on the moon were bothered by too much heat or cold the way Earth people are, he could not stay on the moon.
The moon becomes very, very hot. It becomes as hot as boiling water. And the moon becomes very, very cold. It becomes colder than ice.
Whatever part of the moon the sun shines on is hot and bright. The rest of the moon is cold and dark.
If the man on the moon had to breathe to stay alive, he couldn’t live on the moon because there’s no air there. He’d have to carry an oxygen tank, as astronauts do. There’s no food on the moon, either. Nothing grows—not even weeds（grass）.
If the man on the moon liked to climb mountains, he would be very happy. There are many high places there, such as the raised land around the holes, or craters(火山口), of the moon. Some of these rims are as tall as Earth’s highest mountains.
But if the man on the moon liked to swim, he would be unhappy. There is no water on the moon—just dust and rock.
When you think of what it’s like on the moon, you may wonder why it interests our scientists. One reason is that the moon is Earth’s nearest neighbor—it is the easiest place in space to get to.
Going back and forth between the moon and Earth, astronauts will get a lot of practice in space travel. Things learned on moon trips will be of great help to astronauts who later take long, long trips to some of the planets.
Scientists are also interested in the moon because it has no air. The air that surrounds Earth cuts down the view of the scientists who look at the stars through telescopes. A telescope on the moon would give them a clearer, closer view of the stars.（words: 411）What is the reason why our scientists are interested in the moon.?
| A．The moon is beautiful. |
| B．The moon is different from the earth. |
| C．The moon is Earth’s nearest neighbor—it is the easiest place in space to get to. |
| D．The moon is the easiest place in space to get to and it has no air, unlike Earth. |
The underlined word “rim” in the Paragraph 8 means _________ .
| A．ball | B．hill | C．round edge | D．height |
What is the main thought of the passage?
| A．We can learn much from research on the Moon. |
| B．There may be human beings on the moon. |
| C．If there were a man on the Moon, there would be many similarities between the man on the Moon and on the Earth. |
| D．A telescope on the Moon would help scientists have a clearer, closer sight of the stars. |
Everyone has got two personalities(性格)—the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control your behavior, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their position. The important position is the one that you go to sleep in.
If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to upset people, so you never express your real feelings. You’re quite shy and you aren’t very confident.
If you sleep on your stomach, you are a rather secretive(不坦率的)person. You worry a lot and you’re always easily upset. You’re very stubborn, but you aren’t very ambitious(有雄心的). You usually live for today not for tomorrow. This means that you enjoy having a good time.
If you sleep curled up(卷曲), you are probably a very nervous person. You have a low opinion of yourself and so you’re often defensive（提防的）. You’re shy and you don’t normally like meeting people. You prefer to be on your own. You’re easily hurt.
If you sleep on your side, you have usually got a well-balanced personality. You know your strengths and weaknesses. You’re usually careful. You have a confident personality. You sometimes feel anxious, but you don’t often get depressed（压抑）. You always say what you think even if it annoys people.（words: 278）According to the writer，you naturally show your secret and real personality _______.
| A．only in a normal night |
| B．only when you go to sleep |
| C．only when you refuse to show yourself to the world |
| D．only when you change sleeping position |
Which is NOT mentioned in the second paragraph about a person’s personality?
| A．He or she is always open with others. |
| B．He or she always likes new ideas earlier than others. |
| C．He or she is always easily upset. |
| D．He or she tends（倾向） to believe in others. |
Point out which sentence is used to show the personality of a person who is used to sleeping on his or her stomach?
| A．He or she is careful not to offend（冒犯） others. |
| B．He or she doesn’t want to stick to his or her opinion. |
| C．He or she likes to bring others happiness. |
| D．He or she can’t be successful in any business. |
Maybe you don’t want to make friends with a person who sleeps curled up. Why?
| A．He or she would rather be alone than communicate with you. |
| B．He or she is rarely ready to help you. |
| C．He or she prefers staying at home to going out. |
| D．He or she wouldn’t like to get help from you. |
It appears that the writer tends to think highly of the person who sleeps on one side because __________.
| A．he or she always shows sympathy for people |
| B．he or she is confident，but not stubborn |
| C．he or she has more strengths than weaknesses |
| D．he or she often considers annoying people |
Memory, they say, is a matter of practice and exercise. If you have the wish and really make a self-effort, then you can quite easily improve your ability to remember things. But even if you are successful, there are times when your memory seems to play tricks on you.
Sometimes you remember things that did not happen. One morning last week, for example, I got up and found that I had left the front door unlocked all night, yet I clearly remembered locking it carefully the night before.
Memory “trick” works the other way as well. Once in a while you remember not doing something, and then find out that you did. One day last month, for example, I was sitting in a barber(理发师) shop waiting for my turn to get a haircut, and suddenly I realized that I had got a haircut two days before at the barber shop across the street from my office.
We always seem to find something funny in incidents（小事） caused by people’s forgetfulness or absent-mindedness(心不在焉). Stories about absent-minded professors have been told for years, and we never got tired of hearing new ones. Unfortunately, however, absent-mindedness is not always funny. There are times when “trick” of our memory can cause us great trouble. （words: 169）If you want to have a good memory, ________.
| A．you should force yourself to remember things |
| B．you should make a self-effort of practice and exercise |
| C．you should never stop learning |
| D．you should try hard to remember things |
Which of the following statements is TRUE according to the passage?
| A．One night the writer forgot to lock the front door. |
| B．One night the writer forgot having locked the front door. |
| C．The writer remembered to lock the door. |
| D．The writer remembered unlocking the front door. |
From the sentence "We never get tired of hearing new ones", we can infer that______.
| A．we enjoy hearing new stories about absent-mindedness of professors |
| B．we don’t want to know anything more about absent-mindedness of professors |
| C．we will never get rid of（摆脱） listening to new stories about absent-mindedness |
| D．absent-mindedness happens not only to professors but to many other people |
Now I’d like to talk to you about your final exam. The exam will be held next Thursday, the last day of the exam week. Remember to bring two or three pens in case you run out of ink. And unlike the mid-term exam, this test will not include multiple-choice questions; it will consist entirely of essays(文章). You’ll have to answer three of the five essay questions. The exam will be comprehensive (全面的), which means you’ll be responsible for all of the subject matters we covered in class this term, I would suggest you review your mid-term exam as well as textbooks and your class notes. The final exam will count as 50 percent of your grade of the course. The research project (项目) will count as 20 percent and the mid-term exam 30 percent. I’ll be in my office almost all day next Tuesday. If you run into any problems, please drop in. Good luck to you and I’ll see you on Tuesday. （words: 176）What will be included in the exam?
| A．There will be only multiple-choice questions. |
| B．The exam will contain both multiple-choice and essay questions. |
| C．The exam will have an oral and a written sections. |
| D．Therewill be only essay questions. |
Why does the teacher call the exam comprehensive?
| A．It will be easy to understand. |
| B．Students will be tested on all the materials discussed in class. |
| C．It will cover topics from a wide variety of subjects. |
| D．Students must complete all parts of it. |
The underlined phrase run into probably means.
| A．go into | B．meet somebody unexpectedly |
| C．come up against something with force | D．come across |
When was this talk most likely given?
| A．During the first week of class | B．During mid-term week |
| C．On the last day of class | D．On the last day of the exam week |
“Drink your milk. It’s good for you!” You’ve probably heard that many times, and it’s true. Milk contains calcium, which is a necessary nutrient for keeping bones and teeth healthy and strong. The U.S. government even requires milk as part of the National School Lunch Program, saying that students should drink one cup of fat-free or low-fat milk at each meal.
Last Thursday, however, a group of doctors asked the government to remove milk from the lunch program. The Physicians Committee for Responsible Medicine (PCRM) says, “Milk is high in sugar, high in fat and high in animal protein, all of which have negative effects on health.” “One of the only reasons people talk about dairy, or promote it, is that it is going to help build strong bones.” says Dr. Neal Barnard, president of the PCRM. There are better and healthier ways to get calcium such as eating beans, broccoli, cereals and tofu. Orange juice and soymilk that have calcium added to them also supply the nutrient.
Of course, calcium is important for healthy bones and teeth, but your genes, how much vitamin D you take in and getting an hour’s worth of exercise every day all play a part.
Some nutritionists disagree with the idea that milk isn’t important. Keri Gans, a dietitian, says, “I think it’s irresponsible to take away this beverage that children enjoy, especially among those who are unable to meet their nutrient needs for the day, and remove it from the lunch line.”
The U.S. government is studying the request of the PCRM, but a decision may be a long way off. Meanwhile, Marion Nestle, a professor at New York University, puts it best: “Milk has nutrients. Other foods have the same nutrients. It’s just a food. Like other foods, too much might be a problem.”What is mainly talked about in the first paragraph?
| A．The concern about students’ health. | B．Traditional attitudes towards milk. |
| C．Ways to keep bones and teeth healthy. | D．The practice of the U.S. government. |
According to Dr. Neal Barnard, milk is preferred mainly because _____.
| A．children like its taste | B．people ignore its disadvantages |
| C．it contains more calcium than other foods | D．the calcium in it can build up bone strength |
We can learn from the text that _____.
| A．bone strength is determined by many factors |
| B．people’s diets shouldn’t contain animal protein |
| C．the opinion of the PCRM will soon be accepted |
| D．people should turn to vegetables for calcium |