We've used the wind as an energy source for a long time. The Babylonians and Chinese were using wind power to pump water for irrigating crops 4,000 years ago, and sailing boats were around long before that. Wind power was used in the Middle Ages, in Europe, to grind(磨碎) corn, which is where the term "windmill" comes from.
We can use the energy in the wind by building a tall tower, with a large propellor on the top. The wind blows the propellor round, which turns a generator to produce electricity. We tend to build many of these towers together, to make a "wind farm" and produce more electricity. The more towers, the more wind, and the larger the propellors, the more electricity we can make. It's only worth building wind farms in places that have strong, steady winds, although boats and caravans（大篷车）increasingly have small wind generators to help keep their batteries charged.
The best places for wind farms are in coastal areas, at the tops of rounded hills, open plains and gaps in mountains—places where the wind is strong and reliable. Some are offshore. To be worthwhile, you need an average wind speed of around 25 km/h. Most wind farms in the UK are in Cornwall or Wales. Isolated places such as farms may have their own wind generators. In California, several “wind farms” supply electricity to homes around Los Angeles.
The propellors are large, to obtain energy from the largest possible volume of air. The blades can be angled to cope with varying wind speeds. Some designs use vertical turbines(垂直涡轮机), which don't need to be turned to face the wind. The towers are tall, to get the propellors as high as possible, up to where the wind is stronger. This means that the land beneath can still be used for farming. The first paragraph aims to introduce to us _______.
| A．the function of wind power | B．the source of wind power |
| C．the nations using wind power | D．the history of using wind power |
How does a wind power work?
| A．The generator turns the propellor blades and produce electricity. |
| B．The tall tower helps turn the energy in the air into electricity. |
| C．Warm air rises and makes the propellor move round. |
| D．The propellor blown round by wind turns the generator to produce electricity. |
The best places for building the wind farm are places where _______.
| A．boats and caravans can often be seen | B．isolated farms don’t have enough electricity |
| C．there are less human activities | D．the wind is strong and reliable |
We can infer from the passage that _______.
| A．wind farms will not take up too much farming land |
| B．wind farms need no fuel because wind is free |
| C．the blades can be angled to turn to face the wind wherever it comes from |
| D．the higher and larger the towers are, the stronger the wind is |
What can be a suitable title for the passage?
| A．Where to build a wind farm. | B．ABC of the using of wind energy. |
| C．How to make best use of wind. | D．Wind energy is the best energy. |
It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can't fix the damage. Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys' blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain's temperature was 10°C, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.The biggest difficulty in operating on the damaged brain is that _______.
| A．the time is too short for doctors |
| B．the patients are often too nervous |
| C．the damage is extremely hard to fix |
| D．the blood-cooling machine might break down |
The brain operation was made possible mainly by _______.
| A．taking the blood out of the brain |
| B．trying the operation on monkeys first |
| C．having the blood go through a machine |
| D．lowering the brain' s temperature |
With Dr. White's new idea, the operation on the damaged brain _______.
| A．can last as long as 30 minutes |
| B．can keep the brain' s blood warm |
| C．can keep the patient' s brain healthy |
| D．can help monkeys do different jobs |
What is the right order of the steps in the operation?
a. send the cooled blood back to the brain b. stop the blood to the brain
c. have the blood cooled down d. operate on the brain
| A．a,b,c,d | B．c,a,b,d | C．c, b, d, a | D．b, c, d, a |
Hello! My name is Lisa, and I am a lioness. I live on the open grasslands of Africa with my family. Lions living in a group are called a pride.
My father is strong and powerful. He and his cousin are the leaders of our pride. The other members are my mother, her sisters, and their children.
The area where a pride lives is big! We roar (咆哮) to tell each other where we are and to warn strangers to stay away.
Meet my new baby brother. His name is Leon. See the spots on his fur? We lions are born spotted or striped (有条纹的). As we grow older, the spots gradually disappear.
Lionesses usually spend their entire lives with their birth pride, but Leon will leave when he is about three years old. He’ll run around with a male (雄性的) friend or relative for a few years until they take over a pride of their own.
But for now, we have lots of fun together. We often play and fight for hours, which can help us practice skills that we will need for hunting.
We lions keep ourselves very clean. Just like a house cat, I clean my fur (毛) with my tongue. We clean for each other, too, to show we’re friends.
Lions like to sleep for most of the day. We hunt in the cool evening. Female (雌性的) lions hunt more often than male lions. We work together as a team. At the right moment, we attack and kill our prey. Then we share it. Male lions usually eat first. Females eat next. Baby lions are the last to eat. The smallest one gets the least food.
Since we are full, it’s time to go to find a nice place for a sleep. Bye!According to the passage, Leon _____.
| A．hunts more often than his sisters |
| B．will have spots on his fur for the whole of his life |
| C．will leave his birth pride when he is about three |
| D．will take over his birth pride when his father dies |
The underlined word “prey” in the passage probably means _____.
| A．the animal that is hunted |
| B．the animal that is dangerous |
| C．the animal that is powerful |
| D．the animal that is ill |
Which of the following is NOT true?
| A．Lions sometimes clean their fur for each other. |
| B．Lions also develop their skills of hunting by having fun. |
| C．Lions in Africa usually hunt for food in the evening. |
| D．Baby lions are often the first to get food in their group. |
The passage is written for _____.
| A．doctors | B．tourists | C．children | D．hunters |
Until recently, the "science of the future" was supposed to be electronics and artificial intelligence. Today it seems more and more likely that the next great breakthroughs in technology will be brought through a combination of those two sciences with organic chemistry and genetic engineering. This combination is the science of biotechnology.
Organic chemistry enables us to produce marvelous synthetic materials. However, it is still difficult to manufacture anything that has the capacity of wool to conserve (保存) heat and also to absorb moisture. Nothing that we have been able to produce so far comes anywhere near the combination of strength, lightness and flexibility that we find in the bodies of ordinary insects.
Nevertheless, scientists in the laboratory have already succeeded in "growing" a material that has many of the characteristics of human skin. The next step may well be "biotech hearts and eyes" which can replace diseased organs in human beings. These will not be rejected by the body, as is the case with organs from humans.
The application of biotechnology to energy production seems even more promising. In 1996 the famous science fiction writer, Arthur C. Clarke, many of whose previous predictions have come true, said that we may soon be able to develop remarkably cheap and renewable sources of energy. Some of these power sources will be biological. Clarke and others have warned us repeatedly that sooner or later we will have to give up our dependence on non-renewable power sources. Coal, oil and gas are indeed convenient. However, using them also means creating dangerously high levels of pollution. It will be impossible to meet the growing demand for energy without increasing that pollution to catastrophic (灾难性的) levels unless we develop power sources that are both cheaper and cleaner.
It is attempting to think that biotechnology or some other "science of the future" can solve our problems. Before we surrender to that temptation we should remember nuclear power. Only a few generations ago it seemed to promise limitless, cheap and safe energy. Today those promises lie buried in a concrete grave in a place called Chernobyl, in the Ukraine. Biotechnology is unlikely, however, to break its promises in quite the same or such a dangerous way.According to the passage, the science of the future is likely to be ________.
| A．electronics | B．biotechnology |
| C．genetic engineering | D．nuclear technology |
The materials produced with organic chemistry are ________.at present.
| A．as good as wool |
| B．as good as an insect's body |
| C．better than natural materials |
| D．not as good as natural materials |
According to the passage, it may soon be possible ________.
| A．to transplant human organs |
| B．to make artificial hearts and eyes |
| C．to produce drugs without side effects |
| D．to make something as good as human skin |
In 1996, Arthur C. Clarke predicted that_______.
A. the Chernobyl disaster would happen in two years
B. we will never stop using non-renewable power sources biological
C. oil, gas and coal could be repeatedly used in the future
D. power sources would be put into use soonWhat do we learn from the last paragraph?
| A．Biological power will keep all its promises. |
| B．Biological power is cheaper than nuclear power. |
| C．Biotechnology can solve all our future energy problems |
| D．Biological power may not be as dangerous as nuclear power |
A huge shire horse in Australia has been declared the biggest horse in the world by its owner , beating the current Guinness World Record（吉尼斯记录） by several inches .
The huge five-year-old , from Pakenham , S. E Australia , measures an amazing 20.1 hands , or 2.057m tall . He weighs over 1.3 tons ( 1,300kg) — about the same as a small car — and is still growing . His owner , horse trainer Jane Greenman , 47 , says the only time the horse runs is when there is food on offer . “ He eats an unbelievable amount . I would hate to run a team of eight horses his size—it would send you broke . ” she says .
The massive horse , whose name is Noddy , was born in Australia with its parents imported from England . Noddy’s grandfather , Ladbrooke Edward (UK) was the world’s tallest horse during the 1980’s .But Jane had no idea that the horse she raised from the age of six months would grow this big . Noddy immediately began to rocket and soon overtook both his parents in size .
Although she says that she is not interested in the Guiness Book of World Records , nevertheless Jane has carried out her own research and is sure that Noddy comes top . “ The nearest is a horse in Texas , at 20 hands ,” says Jane . “ Noddy is already an inch taller than that . The frightening thing is he still hasn’t finished—shire horses aren’t fully grown until they’re about six or seven .”
Jane has said that Noddy could be sold overseas , possibly even fetching a record price to match his height . She is unwilling to sell , but to fund the high cost of keeping him she needs to put him to work . “ He needs a job . It’s very hard to find jobs for such a big horse in Australia . I wish he could stay here but I’ve tried everywhere , ” she says regretfully . “ I just want people to enjoy this beautiful animal as much as I do .” How old is the horse now ?
| A．Six months old . | B． Five years old . |
| C．Two years old . | D．Six years old . |
The underlined word “ rocket ” in Paragraph 3 probably means “ ”.
| A．run fast | B．eat a lot | C．grow fast | D．get strong |
Which of the following is a big problem for the horse’s owner ?
| A．She doesn’t know how to apply for the Guinness World Record . |
| B．She has to feed eight big horses at the same time . |
| C．Another horse in Texas is growing even faster than hers . |
| D．There is not enough money to cover（支付） the cost of raising the horse . |
It can be inferred from the passage that .
| A．Noddy won’t grow any taller |
| B．Noddy’s growth can be genetically（基因） explained |
| C．many people are willing to buy Noddy |
| D．no job will be available for Noddy at all |
What would be the best title for this passage ?
| A．Jane Greenman becomes famous for her horse |
| B．New world record for the biggest horse |
| C．Large size means no job for a big horse |
| D．Jane Greenman , an excellent horse trainer |
People in cities all over the world shop in supermarkets. Who decides what you buy in the supermarket? Do you decide? Does the supermarket decide?
When you enter the supermarket, you see shelves full of food. You walk in the aisles (走道) between the shelves. You push a shopping cart and put your food in it.
You probably hear soft, slow music as you walk along the aisles. This may be an attempt to please you, so you will enjoy shopping. Some supermarkets want to increase their profits by playing soft and slow music, because the slow music makes you walk slowly and you have more time to buy things.
Fresh fruit and vegetables are usually put near the entrance. When you arrive at the supermarket, you think about the kinds of fruit and vegetables you need first. Once you’ve got that out of the way, you can relax and do the rest of the shopping without any hurry. Besides, if you see fresh goods first, it gives you a “feel good” impression of freshness, so you can not help spending your money.
Maybe you go to the meat department then. There is some meat on sale, and you want to find it. The manager of the supermarket knows where customers enter the meat department. The cheaper meat is at the other end of the meat department, away from where the customers enter. You have to walk past all the expensive meat before you find the cheaper meat. Maybe you will buy some of the expensive meat instead of the meat on sale.
Most of the food in supermarkets is very attractive. It all says “Buy me quickly!” to the customers. The fresh fruit and vegetables say “Buy me quickly!” as you walk by. The expensive meat says “Buy me quickly!” The supermarket tells you what to buy.Some supermarkets play soft, slow music because it ______.
| A．makes customers walk slowly and buy more |
| B．can help customers get the things they want |
| C．can make customers relaxed and happy |
| D．can tell customers exactly where to go |
The manager knows ______.
| A．where customers come from |
| B．which customers like slow music |
| C．where fresh meat should be put |
| D．which customers like cheap meat |
When walking past the expensive meat, the customers will ______.
| A．pay no attention to it | B．possibly buy some |
| C．look for some cheap meat | D．feel uncomfortable |
If you see fresh goods first in the supermarket, ______.
| A．you know where to get things |
| B．it brings you good luck |
| C．it makes you spend less money |
| D．you’ll get a fresh impression |
Supermarket managers make the food attractive so that ______.
| A．the customers will buy more | B．it looks very expensive |
| C．the customers come often | D．it seems cheap and fine |
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