A. may solve all the problems in teaching

B. is intended to meet people's needs

C. can help people understand the meaning of life

D. makes people understand the voting rules of the Congress

2. What does the word "themselves" in Paragraph 3 refer to?

A. the teachers giving lessons B. the students in the classroom

C. some of the eager students D. all the scientists in physics

3. What do the first two paragraphs mainly tell us?

A. New advances in physics. B. The science of physics.

C. The use of physics in our life. D. Modern developments in science.

　　Like all big cities, Paris has a traffic problem: lots of cars. lots of traffic jams and lots of pollution from exhaust fumes(废气). So the city began a scheme(计划)to improve the situation.

　　Under the Velib scheme ('Velib' comes from velo liberte, or 'bicycle freedom') people can take a bicycle, use it for as long as they want, and then leave it at the same or another bicycle station. The first half-hour-on the bike is free, but if you don't return it after 30 minutes, you have to pay. But it's only ￠ 1 a day or ￠ 29 a year! The bicycles are heavy (25kg), and they are all grey and have baskets. There are about 20,000 of them in the city, and around 1,450 bicycle stations. So there are a lot more Velib stations than the 298 subway stations!

　　Paris is not the first city to have a scheme like this. But not everybody thinks it's a great idea. One Parisian said. "These bicycles are only for short journeys. If people want to travel across the city, they won't use a bicycle-they'll still use their cars."

　　A city spokesman said, "The bicycle scheme won't solve all our traffic problems, of course. But it might help reduce air pollution. Traffic, together with factory fumes, is a big problem. There aren't any simple answers to traffic problems and pollution in cities. But unless we do something now, there will be more traffic jams and temperatures will continue to rise, so the problems in our environment will get worse. The bikes might help people to lead a healthier life, too. "

4. What can we know about the Velib scheme?

A. Its bikes have no baskets. B. Its bikes are light and colorful.

C. It owns more stations than the subway. D. It aims to make traveling easier.