A Train Floating On Air
A train that floats on air? It's not magic―it's magnets (磁). And it's close to reality.
In Virginia USA the fall of 2002, a train with no wheels traveled on air and carried college students across their campus. In Japan, a whisper-quiet railway engine hovered and raced at 350 miles per hour using magnets and electricity as the power. And in China, a magnet train line linked Shanghai with nearby Pudong Airport.
These trains use magnetic levitation (悬浮) technology, “maglev” for short. They use the same rules as the magnets you pick up at home or school: opposite poles of magnets attract each other, and like poles repel each other.
How does it work?
Powerful magnets on the bottom of the train repel magnets on the track, which is actually just a magnet-filled guiding way. With a magnetic field of sufficient force, the train will go hovering on air, which seemed impossible to us in the past.
When an electrical current is sent through the track, the train moves. Turn the current backwards and the train slows down.
Maglev doesn't rely on the friction (摩擦力) of wheels on track, so it can climb a much steeper hill than a traditional train. And it can travel easily in snow and ice, something that could bring normal trains to a screaming stop.
1.This passage is about __________.
A. maglev B. magnets C. levitation D. electricity
2.Which of the following is a repelling action?
A. B.
C.
D.
3.What can we learn from the text?
A. A magnet-filled guiding way is formed inside a maglev train.
B. Instead of electricity, magnets are used as the power of a maglev.
C. Maglev trains can climb hills with the help of magnet wheels.
D. Electric currents decide the movements of a maglev train.
4.What is the difference between a maglev train and an ordinary train?
A. A maglev train can climb mountains without power while an ordinary one can’t.
B. A maglev train can travel in college campus while an ordinary train is not allowed.
C. Travelling without a track, a maglev train is safer and smoother than an ordinary one.
D. Floating on a track, a maglev train is faster, quieter than an ordinary railway train.
Not being able to fall asleep or stay asleep is not a disorder in itself but a sign of some other problems, often a physical one.
If you have trouble sleeping, the American Sleep Disorders Association suggests that, for a week or two, you put down the time you go to bed, get up, exercise, and drink coffee, tea or wine. The purpose is to find the habits that may affect your sleep.
Then:
a. Don’t drink coffee in the six hours before going to bed.
b. Stop smoking and drinking at bedtime.
c. Don’t sleep during the day.
d. Go to bed at the same time every night. Set your alarm clock for the same time every morning and get up at that time, whether or not you sleep well.
e. Use the bedroom only for sleep. Read, watch TV, eat and talk elsewhere.
f. Take sleeping pills according to your doctor’s directions and don’t take them for longer than three weeks at a time.
g. If you haven’t fallen asleep within 15 minutes of going to bed, don’t turn over worrying about it. Get up and read or watch TV until you are sleepy, then return to bed.
If you continue to have trouble sleeping, ask your doctor for help or go to a sleep-disorders center.
1.According to the passage, there is probably if you are not able to fall
asleep or stay asleep.
A. a bad way of sleeping B. a disorder in sleep
C. a physical reason D. a problem caused by the brain
2.If you have trouble sleeping, you should try to ______.
A. ask a doctor for help or go to a sleep-disorders center
B. put down the time you do things every day
C. do more physical exercise
D. find out the cause first
3.According to the passage, which of the following would be the best way to help you sleep well?
A. Taking some sleeping pills every day.
B. Reading books before you go to bed.
C. Setting your alarm clock at night.
D. Forming good living habits.
4.The author writes this article in order to ______.
A. tell us not being able to fall asleep is a serious disease
B. provide us with some suggestions on sleep problem
C. persuade us not to go to see the doctors when we are ill
D. help the American Sleep Disorders Association to find the causes of not being able to fall sleep
阅读下面短文，掌握其大意，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The weather was perfect. We were just out for a picnic. When lunch time came, we decided to go and __1__ what each of us wanted, and meet back on the grass.
Susan and I headed for a hot dog stand. We watched the seller put together the hot dog. But when Susan took out her __2__, the man surprised us.
“It looks a little overdone,” he said, “so you don’t have to pay me.”
We said our thanks, __3__ our friends, and began to enjoy our food. But as we talked and ate, I noticed a man sitting alone nearby, in __4__ clothes. I could tell that he hadn’t had a bath for days. Another homeless person, I thought.
We finished eating but when Susan and I went to __5__ away the lunch bag, I heard a voice ask, “There isn’t any __6__ in that bag, is there?”
It was the homeless man. I didn’t know what to say. “No, I __7__ it already.”
“Oh, really?” was his only answer. He was obviously very __8__.
I felt bad for him, __9__ I didn’t know what to do. Suddenly Susan said, “I’ll be __10__ back. Please wait for me a minute.” I watched curiously as she went across to the hot dog stand. Then I __11__ what she was doing. She bought a hot dog, crossed back, and gave the man the food.
When she came back to us, Susan said simply, “I was just passing on the __12__ that someone gave to me.”
That day I learned how generosity can go __13__ than the person you give to. By giving, you __14__ others how to give also. You never know what happiness a simple __15__ of concern will bring about.
1.A. get B. pass C. drop D. keep
2.A. present B. money C. key D. menu
3.A. joined B. helped C. visited D. guided
4.A. lovely B. special C. dirty D. popular
5.A. drive B. throw C. wash D. pull
6.A. food B. water C. cigarette D. medicine
7.A. bought B. cooked C. served D. ate
8.A. cold B. nervous C. hungry D. crazy
9.A. but B. while C. so D. or
10.A. almost B. still C. just D. right
11.A. remembered B. imagined C. recognized D. realized
12.A. devotion B. kindness C. pleasure D. mercy
13.A. quicker B. higher C. farther D. deeper
14.A. offer B. teach C. train D. advise
15.A. way B. show C. scene D. act
All the tourists _______ about the bad service in that restaurant.
A. explained B. expressed C. promoted D. complained
We are going to ________ a dinner party on New Year’s Eve.
A. do B. have C. play D. join
In Germany, you shouldn’t arrive late to a dinner party; you should always be ___.
A. on time B. at times C. in time D. for a time
