阅读短文，然后根据短文内容选择最佳答案。

　　It is said that as the population of a city grows, so do its problems．Pollution, too many cars, and crowded streets are just a few of these difficulties．One way to help with these problems is city trains．Trains traveling to different parts of a city mean fewer cars and buses on our roads, cleaner air, and more open streets．In recent years, cities such as Guangzhou, Shenzhen and Shanghai have all built city train lines．

　　The first city train line in China was built in Beijing．The oldest part of the train line, from Beijing Zhan to Ping Guo Yuan was opened in 1969．Its length was 23.6 kilometres．As the city grew after 1980, so did the need for more trains．A newer train line was built to help move people around the city centre．The 16-kilometre-long “circle(环形)line” was finished in 1987．Since that time even more train stations have been built and today the train lines in the city are over 50 kilometres long．

　　For the 2008 Olympic Games, the trains of Beijing will be very important．It is thought that most of the people who go to watch the different sports during the Games will travel using trains．

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阅读理解

　　Every year several thousand people are killed on the road in Great Britain．Every year between one and two hundred people are hurt．These people are killed or hurt in road accidents．

　　There are rules to make the roads safe, but people do not always obey the rules．They are careless．If everybody obeys the rules, the roads will be much safer．How can we make the roads safe?

　　Remember this rule．In Great Britain traffic keeps to the left．Cars, buses and bikes must all keep to the left side of the road．In most other countries traffic keeps to the right．

　　Before crossing the road, stop and look both sides．Look right and left then．If you are sure that the road is clear, it is safe to cross the road．If you see small children or very old people, help them to cross the road．We must teach young children to cross the road safely．We must always give them a good example．Small children must not play in the street．

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阅读理解。

　　When you are in England, you must be careful in the streets because the traffic drives on the left．Before you cross the street, you must look to the right and then the left．

　　If the traffic lights are green, the traffic can go．People on foot mustn’t cross

　　In the morning and in the evening when people go to or come from work, the streets are busy．The traffic is the most dangerous then．

　　When you go by bus in England, you have to be careful too．

　　Always remember the traffic moves on the left．So you must be careful．Have a look first or you will go the wrong way

　　In many English cities, there are big buses with two floors．From there you can see the city very well．It’s very interesting．

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