根据以下资料，回答36-39题。　　Years ago our cities were full of cars, buses and trucks．Now the streets are completely congested (拥挤的) 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 enormous ( 巨大的 ) motorways be built across them? With-big motorways cutting across them, full of noisy, dirty cars and lorries, 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 1989, for example, the authorities in Rome began an interesting experiment: passengers on the city buses did not have to pay for their tickets.
　　In Stockholm there was another experiment: people paid very little for a season ticket to travel on any bus, trolley bus, train or tram in all the city.
　　In many cities now some streets are closed to vehicles, 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 taxies in front of them.

What the writer worries about in a big city is __.

A

the number of traffic lights

B

the shortage of buses

C

the lack of motorways

D

the traffic congestion

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答案：

D

解析：

文章第一段提到现在的街道非常拥堵，开车很难行驶，作者对于未来的城市交通状况感到担忧，担心未来的城市是否会因为交通拥堵而变得更加糟糕。因此，作者担心的是交通拥堵问题，选项D是正确答案。

What the writer worries about in a big city is __.

答案：

解析：

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