B

    A school busis a kind of bus designed (设计) for student transport: carrying children and teenagers to and from school. So safety(安全) is very important. We should have the same logo (标志) on the school bus and color it yellow so that people can see it far away. People design everything on the bus to keep the students safe, such as, we can pushthe windows easily, the computer can ask the student to wear the seatbelt when the students sit on the seat. There is at least one teacher to look after the students on the bus. When the students get on or get off the bus, the driver should use the traffic lights to tell other cars, then the other cars can wait until the students are safe. When a school bus is on the way, we can know where it is and what it happens on the computer. In a word, we must find ways to make sure the traffic safety is first.

    My holiday is coming.Yesterday I asked my American friends about the best way to travel around the United States. They said it was best to travel by 1 and gave me the 2.

    To fly, of course, is the fastest way, but one can't see anything during a 3 except the blue sky and white clouds. So it is not very interesting for one who wants to see the 4.Besides, the plane ticket is very 5.

    To travel by train is 6, because passengers can walk and buy food and drinks on a train. They can also see cities and the country through the windows. But trains don't leave or 7 at a place every day, and don't go to many cities.

    To travel by bus is easy, cheap and convenient, though not so fast as travelling by plane or so 8 as by train. You can find buses almost in every city. That makes travel arrangement easy.

    I take their 9.Now I have decided to go on an interesting 10 by bus to the east coast.

    Car Free Day encourages drivers to give up their cars for a day to protect the environment. People from around the world get together in the streets to remind the world that we don't have to accept the society full of cars. It was first started by 34 cities in France and September 22 is Car Free Day. The first Car Free Day in China was in Chengdu in 2001. The slogan for the day is "If we drive for one less day, we can have one more nice day."

    Organized activities are held in many cities on Car Free Day. In Brussels, Car Free Day shall be valid (有效的) for everybody except persons with a special permit(许可证), but they have to slow down to the speed of 30 kilometers per hour. The public transportation is free on that day. In London, they have special "green areas". Walking, biking and public transportation are encouraged. The streets are open only to walkers, bicycles and buses from 7: 00 a. m. to 7: 00 p. m. In Beijing, it asks drivers to leave their cars at home for one day each month and walk or ride a bike to work. More and more people are joining in the activity. In the first quarter of this year, Beijing only had 52 blue sky days, and you may see haze(雾霾) almost every day! We must do more for Car Free Day as a Beijing driver said, "We may not change the weather, but we can choose not to drive."

    But we do not want just one day and then a return to "normal" life. We should go on with Car Free Day.