Los Angeles, California, for example, has no subway system and buses are slow. Instead, many commuters (乘、开车上班族) drive many miles from their homes to work. Many of these drivers spend several hours each day on busy freeways. New York, however, has a big transit system — buses, commuter trains, and subways. Because the public transportation is crowded and dirty, many people drive private cars, and the traffic jams are worse than that in Los Angeles. A taxi driver complains, “I was driving home, but in forty-five minutes I moved only two miles! Finally, I turned off the engine and just sat there. A lot of people left their cars where they were in the middle of the street and went into a bar for a few beers!”

　　On the other hand, some cities have clean, fast and pleasant public transportation systems. In Paris, France, and Toronto, Canada, for example, anyone can use buses or subways to move quickly from one part of the city to another.

　　46. What do some people think is the main problem of the future city like?

　　       A. Poor housing.                          B. Overcrowding.   

　　C. Environmental pollution.           D. Traffic jams.

　　47. The best way to work out the traffic problem in Los Angels might be _________________.

　　    A. cutting down the number of private cars

　　    B. providing more buses in the freeway

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