阅读理解。
Traveling to work by car gets more expensive today. People can do nothing about the world's price of
petrol (汽油). They have to work hard so that they can pay for petrol. However, some people are trying
to stop driving to work..
People have found out that it is good to ride a bike to work. More and more people return to bikes.
Children often go to school by bike. But now businessmen are going to work by bike too. "The bike is
easy to use," says Molly, "and it is also very cheap. You can buy 300 bikes at the price of a small car. A
bike doesn't use expensive petrol. A 10-year-old child can learn to use a bike. And most bikes can be
used for a long time."
Mr. Brown goes to his hospital by bike every day. He says, "A bike doesn't need a lot of money, and
bike- riding is good for our health. Today most people get fat because they don't get enough exercise. So
I tell people to buy bikes. What's more, in big cities it's usually quicker to travel by bike than by bus or
by car. Drivers can't do anything but get angry when there is a traffic jam (交通堵塞)."
1. The first paragraph mainly tells us _____.
A. it's good to drive to work
B. it's too expensive to drive to work.
C. some people stop to drive to work
D. it's cheap to ride a bike to work
2. According to the passage _____ usually go out by bike.
A. patients
B. workers
C. businessman
D. students
3. If a car is 90 thousand dollars, a bike may be _____ dollars.
A. 30
B. 300
C. 3,000
D. 30,000
4. The underlined word "patient" means "_____" in Chinese.
A. 学生
B. 医生
C. 病人
D. 司机
5. From the passage, we mainly know _____.
A. it's good to ride bikes
B. there are too many cars
C. the traffic is heavy
D. cars are expensive for us
试求：
，X+Y=3，
(k=0，1，2，3)，并且
，故
