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Have you seen the film Star Wars? If you have, you’ll know what an energy–gun is, and a light–sword too. The gigantic space ship in Star Wars can destroy a whole planet in a second or two, and it does so. Fortunately, it isn’t our planet; it belongs to a distant system, far out in space.
The great empty spaces of the universe are no problem in star Wars. The fighters know how to fold space over, like a sheet of paper, so that very distant stars are brought close together; they call it “hyperspace”. This means, of course, that their ships don’t have to creep along at the speed of light. If they did that, they would take years, even centuries, to reach the battlefield. Hyperspace allows them to travel as “supralight” speed and get there in a couple of hours. It’s good clean fun (健康无害的娱乐) though.
We certainly don’t know all about physics yet, but we do have the work of Albert Einstein. He asked us to believe that nothing could travel faster than light through an empty space --- but don’t let that miserable idea spoil the film for you, even though all our observations up to now have shown that Einstein was dead right --- forget it. Sit back and watch those energy–shells blow up the hated enemy. The Star Wars princess is extremely beautiful.
The more we “discover”, the more we must admire Einstein. He knew it all before us --- by about 1910 in fact. We observe certain very high speed particles (微粒), and they behave exactly as Einstein predicted they would. We can give them a speed almost equal to light, but they never quite reach light speed. He predicted that a very fast–moving object, as it flashed by a stationary observer(静止的参照物), would seem to have much greater weight than usual. And that, too, was proved correct.
So far as scientific theory or evidence is concerned, there is no such thing as hyperspace, no such speed as supralight. Space is as we know it, and light speed is the highest possible speed. “But,” say the story-writers, “that’s only true at present. We don’t know all about physics yet. Who knows --- who knows if there isn’t another set of facts just waiting to be discovered; another universe perhaps, just round the corner?”
Einstein seems to have been prepared for that too. In his theories he emphasized the word “relative”. Everything --- speed, weight, time, etc. --- is relative to something else. Nothing, by itself is real or absolute. So if there is another universe somewhere, we shall only know about it relative to ourselves. So far there’s no sign of it. But for the future, well, who knows?
51．What is the purpose of science – fiction stories and films?
They point out the way ahead, and scientists are grateful.
They encourage us in our searching for the truth.
They show us what the future universe will be like.
They are written and made to entertain us.
52．If you see Star Wars, what might spoil it for you, according to the passage?
A．Einstein’s theories.
B．The uncomfortable surroundings of the theatre.
C．The ugly actress and actors.
D．The rude audience.
53．Einstein predicted that the increase in weight .
applies only to big things, like huge space–ships
is apparent only to the stationary observer
is a real increase
remains even after the objective has stopped moving
54．Einstein’s theories emphasized .
A．everything is relative to something else B．the universe is infinite (无限的)
C．light speed is the highest possible speed D．there is another universe somewhere
55．Although Einstein did not observe the behavior of high–speed objects, .
his theories predicted they travels at light speed
his theories predicted them with great accuracy
he knew they would be discovered
he predicted them in the year 1910
查看习题详情和答案>>You may think I want to change my job. Well, at the moment I do. As one of my friends says－even doctors have a few friends－it's all experience. Experience! I don't need such experience. I need a warm, comfortable, undisturbed bed of my own. I need it badly. I need all telephones to be thrown down the nearest well, that's what I need.
All these thoughts fly round my head as I drive my Mini (微型汽车) through the foggy streets of East London at 3?45 a. m. on a December morning. I am a ministering angel in a Mini with a heavy coat and a bag of medicines. As I speed down Lea Bridge in the dark at this horrible morning hour, the heater first blowing hot then cold, my back aching from the carseat, I do not feel like a ministering angel. I wish I were on the beach in Southern France. Call me a bad doctor if you like. Call me what you will. But don't call me at half past three on a December morning for an earache that you have had for two weeks.
Of course, being a doctor isn't really all bad. We do have our moments. Once in a while people are ill, once in a while you can help, once in a while you get given a cup of tea and rockhard cake at two o'clock in the morning－then you worry if you have done everything. But all too often 'everything' is a repeating rule: look, listen, feel, tap. Pills, injection, phone, ambulance, away to the next.
And then there is always the cool, warm voice of the girl on the switchboard(总机) of the emergency bed service who will get your patient into hospital for you－the pleasant voice that comes to you as you stand in the cold, dark, smelly, dirty telephone box somewhere in a dangerous section of town. Oh, it has its moments, this life does.
1. According to the sentence "Anyone who's studying medicine should have his head examined", we
know that ________.
A. the writer thinks that those who want to be doctors are crazy
B. a doctor must be mentally strong so that he can meet any difficult situation
C. a medical student should have a very good memory
D. to be a doctor is a challenge for people's mental health
2. Which of the following statements is NOT true?
A. The writer wishes he could have a quiet, undisturbed night in bed at home.
B. One of his friends says that being a doctor helps one gain all sorts of experience.
C. He hates the telephone as a modern means of communication.
D. He is not happy with the small and uncomfortable car he is driving.
3. The statement "We do have our moments" could best be replaced by "________".
A. We doctors are called at a moment's notice to see people who need medical treatment
B. Usually we are glad that we can do something to help the sick
C. Sometimes we find people are thankful for our help
D. There are chances that doctors find their work rewarding and satisfying
4. From the whole passage we know that the writer ________.
A. is a bad doctor, unwilling to make a house call during the nighttime
B. is so dissatisfied with his job that he wishes to find a new one
C. is satisfied with his job but he hates to be called out unnecessarily
D. thinks a doctor can enjoy certain special rights whether he felt lucky or not
5. We can conclude that ________.
A. the author is worried about his patient when he is driving through the foggy streets of East London
B. the author is annoyed to be called out at such a horrible morning hour for an earache patient
C. the author is now heading for the beach in Southern France for his holidays
D. as the author speeds down Lea Bridge in the dark on a December morning, his Mini breaks down
half way
阅读理解
In 1959 an ordinary American family paid $989 for a year's supply of food. In 1972 the family paid $1311. Why does food cost so much?
Vegetables cost more when they have been washed and cut and sometimes even cooked before being packaged. Chicken costs more when it has been cut into pieces by someone other than the one who buys it. A family should expect to pay more when several“TV dinners”are taken home from the store. These are fully cooked meals, including meat, vegetables, and so on, all arranged on a metal dish. The dish is put into the fire and heated while the housewife is doing something else(cleaning the house, perhaps, or resting or watching TV). Such a convenience costs money. It transfers(转换) much of the time and work of meal preparation from the kitchen to the food plant.
Economists tell us that many modern housewives have jobs outside their home. They make money that helps to pay the family food bills. The housewife naturally has less time and energy for cooking after a day's work．She wants to buy many kinds of food that can be put on her family's table easily and quickly.
“If the housewife wants all kinds of these,”the economists say,“that is her right, but she must be prepared to pay for those who make her work easier.”
1．The price of food increased by _____ in the United States from the year 1959 to 1972.
[ ]
A．about fifty percent
B．about twenty percent
C．nearly one third
D．nearly two thirds
2．According to the passage,“TV dinners”are usually _____.
[ ]
A．expensive food sold by TV stations
B．meat mixed with vegetables
C．fully-cooked food sold in shops
D．heated vegetables cooked on TV
3．The reason why food costs so much in America now is that _____.
[ ]
A．the price of everything has increased as well
B．a lot of work of food preparation has been done by food plants
C．American housewives have less time and energy
D．there isn't enough food for so many people
查看习题详情和答案>>阅读理解
In 1959 an ordinary American family paid $989 for a year's supply of food. In 1972 the family paid $1311. Why does food cost so much?
Vegetables cost more when they have been washed and cut and sometimes even cooked before being packaged. Chicken costs more when it has been cut into pieces by someone other than the one who buys it. A family should expect to pay more when several“TV dinners”are taken home from the store. These are fully cooked meals, including meat, vegetables, and so on, all arranged on a metal dish. The dish is put into the fire and heated while the housewife is doing something else(cleaning the house, perhaps, or resting or watching TV). Such a convenience costs money. It transfers(转换) much of the time and work of meal preparation from the kitchen to the food plant.
Economists tell us that many modern housewives have jobs outside their home. They make money that helps to pay the family food bills. The housewife naturally has less time and energy for cooking after a day's work．She wants to buy many kinds of food that can be put on her family's table easily and quickly.
“If the housewife wants all kinds of these,”the economists say,“that is her right, but she must be prepared to pay for those who make her work easier.”
1．The price of food increased by _____ in the United States from the year 1959 to 1972.
[ ]
A．about fifty percent
B．about twenty percent
C．nearly one third
D．nearly two thirds
2．According to the passage,“TV dinners”are usually _____.
[ ]
A．expensive food sold by TV stations
B．meat mixed with vegetables
C．fully-cooked food sold in shops
D．heated vegetables cooked on TV
3．The reason why food costs so much in America now is that _____.
[ ]
A．the price of everything has increased as well
B．a lot of work of food preparation has been done by food plants
C．American housewives have less time and energy
D．there isn't enough food for so many people
查看习题详情和答案>>Dear Mr. Perkins,
We would like to introduce ourselves. Our company was organized only two years ago, but we are one of the largest boat companies in
Thank you.
Tony Valention
56. The main aim of the letter Tony wrote to Mr. Perkins is to __________.
A. tell him to sign the contracts B. thank him for buying a new boat
C. tell about something of his company D. ask him to pay for his boat right away
57. The underlined word “contracts” means ________.
A. application forms from the buyers B. letters sent by the sellers
C. formal agreements having the force of law D. designs of a new product
58. From the passage we can see that the boat company __________.
A. isn’t an old one B. is a world-famous one
C. is developing slowly D. has to advise customers to buy its boats
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