Dan was the doorman of a club in a big city. Every day, thousands of people passed his door, and a lot of them stopped and asked him, “What's the time, please？”

    After a few months, Dan said to himself, “I'm not going to answer all those stupid people any more. I'm going to buy a big clock and put it on the wall here.” Then he did so.

    “Now people aren't going to stop and ask me the time.” He thought happily.

    But after that, a lot of people stopped, looked at the clock and asked Dan, “Is that clock right?”

    One afternoon, Kate and her brother, Bob, went out to play. Kate was eight, and Bob was ten. "Let's go to the bridge and we can see fish in the river." said Kate.

    "I don't know…" Bob said." Mum told us, "Don't go on the bridge." She said it's dangerous.

    Kate said," I am not afraid. Are you?"

    They walked onto the bridge and began looking for fish in the river. The bridge was a train bridge. Trains went over the bridge three times a day.

    The children were standing in the middle of the bridge when they heard a loud noise. "A train is coming!" Bob shouted. "Run!" He ran to the end of the bridge. He was safe.

    Kate ran, too, but she fell. The train was coming fast. Kate ran towards Bob. She fell again right on the train tracks（铁轨）. There was no time to leave. She had to lie down between the tracks. A few seconds later, the train went over the girl, but she was not hurt at all. She stood up and said to Bob, "Don't tell Mum! Don't tell Mum!"

    At last their mother found out the story. She was angry because they went on the bridge. But she was happy that Kate was all right.

In some cities, we can see more and more people riding sharing- bikes. It's very convenient to use the bikes if you have a smart phone. First, you have to download such an APP on your smart phone. Then, what you need to do is to find a nearest bike through the  APP, scan the QR code on the bike or connect your phone with the bike over a Bluetooth   wireless connection. You will find the bike can be unlocked itself easily. Then, you can enjoy your trip. What's more, the greatest advantage of bike- sharing is that you can easily find one and never worry about where to park it. The cost of riding depends on the time that you spend. Normally, every hour you ride, you need to pay one yuan. It doesn't cost so much, does it?

At the same time, some people park the bikes in their own homes, Besides, some people don't value the bikes. Now service companies are trying to solve the problems like being stolen.

Technology and science have changed our social lifestyles. We have to say bike- sharing brings us more convenience without doubt, And we also hope that people can not only enjoy it but also put it to good use.

①Yellowknife, Whitehorse and Come By Chance — all are names of towns and cities in North America. Ottawa, Beijing, Paris, Hanoi and Tokyo — all are important world cities. But how did they get these names? And why?

②Some names sound funny, and some of them make no sense when you first hear them. But there is always a story or a tradition behind a name. People live in an area. A city begins to grow. In the beginning, it might have no name, but soon, people start calling it something. When enough people use this name, it usually sticks. And a new city name is born.

③In the tradition of East Asia, important cities are given names that tell us exactly what they are, and where they are located (位于). Nearly everyone will know that Beijing means "northern capital". But do you know that Tokyo and Hanoi mean "eastern capital"?

④Ottawa, Canada's capital city, was given its name thousands of years ago. It is located at a place where two rivers meet, and was a place where Indian nations came to trade with each other long ago. In the native (当地的) language, Adawe means "to trade". When the Europeans lived in the area, they heard the natives calling the place Adawe. This sounded like Ottawa to the European ears. Soon enough, everyone was calling the city Ottawa.

⑤When a European explorer (探险家) arrived at a place in the far northern area of Canada, he found native people carried huge knives made of copper (铜), which appeared yellow in the shining sun. The explorer decided to call them Yellow knives. He named the place where they lived Yellowknife.

⑥Next time you hear an unusual city name, see if you can discover how it got that name.

根据材料内容选择最佳答案。

What's an American school like? There are some buildings in it, two classroom buildings, an office building, a science building, a sports hall, a dining hall and a big library. Every school has a big playground too. There are lots of trees and flowers in it, so some schools looks like parks. Many students like to read under trees. 

There are 20 or 30 students in a class. In the classroom, five or six students sit together as a group. Every student has a box. They can place their books and clothes in it. 

Students have six or seven classes every day. They study science, math, English and other lessons. Students go to different classrooms for every class. That's because every teacher has his or her own classroom. 

The school day finishes early in the afternoon. Most students join different after school activities like sports, game after school. Every student lives a busy but interesting school life.