For a lot of our time, we sit in the traffic jams（交通拥堵）. But that's not the only problem with traffic. Smoke（烟） from our cars is bad for animals, plants and us! And it's making the world warmer. That may be our biggest problem in a few years.
Bicycles are a good answer. They don't make smoke. They're good for our bodies and they're fun. But cycling（骑自行车） to work can be hard, very hard if you live many kilometers away from your workplace.
Do you know about the World Car-Free Day on September 22? On that day, people leave their cars at home. They take the bus or train, or they cycle to work. Some people walk if they live near their workplace.
Why is World Car-Free Day good? First, for one day in a year there's less traffic. What's more, it helps people to think about the problem of traffic. They see that buses and trains aren't so bad, or that cycling and walking are good for them.
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（1）
In the first paragraph the writer wants to tell us that _________.
A . traffic jams are the most important problem
B . cars play an important role in our life
C . smoke is the most important problem
D . the world becomes warmer only because of the smoke
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（2）
Why is it hard to cycle to work?
A . It's boring.
B . It's too expensive.
C . It also makes traffic jams.
D . It makes people tired in a long trip.
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（3）
What is special on World Car-Free Day?
A . People don't drive cars to work.
B . People don't have to go to work.
C . People can take the train for free.
D . People can go out by car for free.
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（4）
What may people do on World Car﹣Free Day according to（依据） the last paragraph?
A . They may have a day free of work.
B . They may have a day of busy traffic.
C . They may start to think about traffic problems.
D . They may start to know the importance of cars.
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（5）
What's the best title for the passage?
A . The Ways to Keep Healthy
B . The Ways to Work at Home
C . The Ways to Do with（处理） Smoke from Cars
D . The Reason（原因） to Have World Car﹣Free Day
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