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.
1.According to the passage, the danger of nuclear power lies in .
|
A．nuclear mystery |
B．radiation detection |
|
C．radiation level |
D．nuclear radiation |
2.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 |
3.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. |
Most young people enjoy some form of physical activity. It may be walking, cycling, or swimming, or in winter, skating or skiing. It may be games of football, hockey, golf, or tennis. It may be mountaineering.
Those who have a passion for climbing high and difficult mountains are often looked upon with astonishment. Why are men and women willing to suffer cold and hardship, and to take risks on high mountains? This astonishment is caused probably by the difference between mountaineering and other forms of activity to which men give their relaxation.
Mountaineering is a sport and not a game. There are no man-made rules, as there are for such games as golf and football. There are, of course, rules of a different kind which it would be dangerous to ignore, but it is this freedom from man-made rules that makes mountaineering attractive to many people. Those who climb mountains are free to use their own methods.
If we compare mountaineering and other more familiar sports, we might think that one big difference is that mountaineering is not a “team game”. We should be mistaken in this. There are, it is true, no “matches” between “teams” of climbers, but when climbers are on a rock face linked by a rope on which their lives may depend, there is obviously teamwork.
The mountain climber knows that he may have to fight forces that are stronger and more powerful than man. He has to fight the forces of nature. His sport requires high mental and physical qualities.
A mountain climber continues to improve in skill year after year. A skier (滑雪者) is probably past his best by the age of thirty, and most international tennis champions are in their early twenties. But it is not unusual for a man of fifty or sixty to climb the highest mountains in Alps. They may take more time than younger men, but they probably climb with more skill and less waste of effort, and they certainly experience equal enjoyment.
1. The main difference between a sport and a game lies in .
|
A．activity |
B．uniform |
C．rules |
D．skills |
2. Mountaineering can be called a team sport because .
|
A．mountaineers depend on each other while climbing |
|
B．teams compete against each other |
|
C．it is an Olympic event |
|
D．there are five climbers on each team |
3.Which of the following might be the best title?
|
A．How to Climb High Mountains |
B．Mountain Climbers |
|
C．Challenging Sports Activities |
D．Mountaineering |
A well-known manufacturer of weighing machines produced a new model.
The machine had a computer inside it, and this computer could do wonderful things: it could weigh people very accurately; it could tell them their weight in their own language; and it could tell them what they should eat to reduce their weight.
The manufacturer decided to try out his machine before he sold it to the shops.
He looked around for a good place to put it and finally decided on an airport. There were always people at an airport from many different countries.
The first person to use the machine was an Italian woman. She stood on the machine, put a coin in and waited to hear her weight.
The machine took only a second or two to weigh her, decide on her nationality and the language she spoke, and figure out what kind of food she should eat.
“Good morning, madam,” it said in perfect Italian. “Your weight is 72 kilos, three more than it should be for a woman of your height, age and nationality. This is because you have been eating too much spaghetti. I suggest you eat more fruit and vegetables. Please have a nice day”.
The second person to use the machine was a Chinese girl. She stood on the machine, put a coin in and waited to hear her weight.
“Good morning, Miss," the machine said in perfect Chinese. "Your weight is 38 kilos, exactly the correct weight for your height, age and nationality. Continue to eat what you are eating. Please have a nice day.”
The third person to use the machine was a huge Australian woman. She walked up to the machine and looked at it for a long time. At last she found the courage to stand on the machine and put a coin in. The machine spoke immediately. “Good morning. Will one of you ladies please get off?”
1. What could the computer do?
|
A．Weigh and talk to people. |
B．Translate information. |
|
C．Give them diet pills. |
D．Make them lose weight. |
2. What did the machine say to the Italian woman?
|
A．She was a little too light. |
B．She was a little too heavy. |
|
C．She disliked spaghetti. |
D．She couldn’t speak Italian. |
3.What did the machine say to the Chinese woman?
|
A．She should eat more. |
B．She could speak Chinese. |
|
C．She would have a nice day. |
D．She was fine. |
4.What did the machine suggest about the Australian woman?
|
A．She was unwell. |
B．She was courageous. |
|
C．She was too heavy. |
D．She had dieted well. |
A young man was getting ready to graduate from college. For many months he had loved a beautiful sports car in a dealer’s showroom, and knowing his father could well 16 it, he told him that was all he wanted.
As 17 drew near, the young man expected 18 that his father had bought the car. Finally, on the morning of the special day, his father called him into his study. His father told him how 19 he was to have such a fine son, and how much he loved him. He handed his son a beautiful wrapped (包装好的) gift box. Curious, but a little bit 20 , the young man opened the box and found a lovely Bible (圣经).
Angrily, he raised his 21 to his father and said, “Is a Bible 22 you can give me with all your money?” He then stormed out of the house, leaving the Bible.
Many years 23 and the young man was very successful in business, but 24 his father was very old, he thought perhaps he 25 go to see him. He had not seen him since that graduation day. 26 he could make the arrangements (安排), he received a telegram which 27 him of his father’s death, and all the possessions (财产) willed (立遗嘱) to him.
28 arriving at his father’s house, sudden sadness and regret filled his heart. He began to 29 through his father’s important papers and saw the still new Bible, just as he had 30 it years ago. With tears, he opened the Bible and began to 31 . As he was reading, a car 32 dropped from the back of the Bible.
How many times do we 33 blessings (祝福) because they are not wrapped as we expected? Do not spoil (搞糟) what you have by desiring (渴求) what you have not; but remember what you now have was once 34 the things you hoped for. What may appear as bad fortune (运气) may 35 be the door that is just waiting to be opened.
|
1. |
|
|
2. |
|
|
3. |
|
|
4. |
|
|
5. |
|
|
6. |
|
|
7. |
|
|
8. |
|
|
9. |
|
|
10. |
|
|
11. |
|
|
12. |
|
|
13. |
|
|
14. |
|
|
15. |
|
|
16. |
|
|
17. |
|
|
18. |
|
|
19. |
|
|
20. |
|
With real estate （房地产）______ in economy, a lot of rich farmland had to ______ new houses and offices in the area.
|
A．leading the way; make way for |
B．led the way; made the way |
|
C．to lead the way; be made the way for |
D．leading way; be made the way for |
He suffers two heart attacks in a year. It hasn’t stopped him drinking wine, ______.
|
A．though |
B．either |
C．too |
D．neither |
