阅读短文，根据短文内容回答问题。
　　Making a TV show is a lot of fun. But it’s also a lot of work. So how do you make a TV show? One of the most important parts of a TV show is the set. Sets are where the stories happen. Sets can look like a room in a house, a restaurant, or even a jungle.
　　Would you ever want to act on TV? Being an actor on TV is fun. You can be famous and sign autographs. But it’s also a lot of work. If you don’t want to be an actor, there are other jobs you can do in a TV studio. You can be a director, or you can work with lighting or sound. Many people work together during filming to make sure the show looks good.
　　More people work on the TV show after it is filmed. They are editors. Editing a TV show means putting the different parts of the show together to make a whole show. When someone edits the show, they also add music or sound effects to make the show more interesting.
　　So what do you think? Would you ever want to work in a TV studio? It might be fun!
　　48. Is making TV show a lot of work?　
　　49. What are sets?　
　　50. Why do many people work together during filming?
　　51. Who work on the TV show after it is filmed?
　　52. What’s the work at a TV show like?
　　　

 ---What are ______ (this)?　 ---They are pears

Large population has caused many problems. For example, the traffic is very heavy in some big cities.

During the last ten years, big cities like Beijing and Harbin were full of cars and buses. Now the streets are completely crowded and it’s 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 the future? How can we solve the problem?

There are some good ideas to reduce the use of private(私人的) cars. In 1971, the officer in Rome began an interesting experiment: Passengers on the city buses didn’t 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(电车) and train 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 streets is for buses only. So the buses can travel fast. There are no cars or taxis in front of them.

根据短文内容, 选择最佳答案。

1.The passage is about         .

A．big cities          B．streets            C．cars              D．traffic

2.The city of          once experimented on a completely free bus service.

A．London           B．Paris             C．Rome            D．Stockholm

3.The city of          experimented on a very cheap bus service.

A．Paris             B．Stockholm         C．London           D．None of the above

4.The underlined word “pedestrians” means_________ in Chinese.

A．行人             B．司机             C．旅客             D．向导

5.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