阅读理解。

    During the last ten years, our cities were full of cars, buses and trucks. Now the streets are completely

crowded and it is very difficult to drive a car along them. Drivers must stop at hundreds of traffic lights.

    What are our cities going to be like in ten or twenty years? Will many motorways (高速公路) be built

across them? With big motorways cutting across them, full of noisy, dirty cars and trucks, our cities are

going to be awful places. How can we solve the problem?

   There are some good ideas to reduce the use of private cars. In 1971, for example, the authorities (官方)

in Rome began an interesting experiment: passengers on the city buses did not have to pay for their tickets. 

   In Stockholm (斯德哥尔摩) there was another experiment: people paid very little for a season ticket to

travel on any bus, trolley bus, train or tram all over the city. In many cities now some streets are closed to

vehicles (机动车) and pedestrians are safe there. In London there is another experiment: part of the street

is for buses only, so the buses can travel fast. There are no cars or taxis in front of them.

1. What does the writer worry about in a big city? The ___.[ ]

A. number of traffic lights

B. shortage of buses

C. lack of motorways

D. traffic congestion (拥挤)

2. Which city once experimented on a completely free bus service? ___. [ ]

A. London

B. Paris

C. Rome

D. Stockholm

3. Which city once experimented on a very cheap bus service? ___. [ ]

A. London

B. Stockholm

C. Rome

D. None of the above

4. In many cities pedestrians are much safer because ___.[ ]

A. no traffic is allowed in some streets

B. traffic is computer controlled

C. cars move very slowly

D. only one way streets are open to traffic

5. In Chinese "pedestrians" means___.[ ]

A. 司机

B. 行人

C. 旅客

D. 动物