During the Winter Olympics, the Beijing-Zhangjiakou high-speed train took passengers to Beijing, Yanqing and Chongli, where the events were held. Passengers on the train were provided with the best services.

The crew (乘务组) took all kinds of classes, including customer services, foreign languages, sign language, winter sports knowledge, etiquette (礼仪), and make-up skills two years before the Winter Olympics. They were busy like students. When passengers asked them anything about the winter games, they provided certain information.

All the efforts were made to offer the best services. These details (细节) made passengers enjoy their travel on the train. And the train continued welcoming more and more winter sports lovers with the best services!

Bicycles are used by people of all ages around the world. It's common in many cities to see thousands of bikes streaming down a street.

At first, only men rode bicycles. It was thought that only men could run machines, and that women wouldn't be able to control a bicycle. In the 1890s, though, with women's growing independence(独立), bicycles offered women a way to travel by themselves. Today, of course, men, women, and children ride bicycles.

Most bikes today have two wheels, but you've probably seen other kinds, too.

Some people start riding bikes that have three wheels. The third wheel makes the bike easier to balance. These bikes are called tricycles. As you've seen, the bi- in bicycle means "two". The tri- in tricycle means "three". Bikes with three wheels aren't just for young children. They matter to adults because bikes with three wheels can help move people or things. The most common kind of adult tricycle is the rickshaw(黄包车). Rickshaws are used as bike taxis in many parts of the world.

Some bikes also have only one wheel and no handlebars(把手). These bikes are called unicycles. The first part of the word, uni-, means "one". Riding a bike with only one wheel is a balancing act—that's why unicycles are used in the circus(马戏团).

There are also bikes with four wheels. Bikes with four wheels are called quadracycles. Again, the first part of the word refers to the number of wheels. In this case, quadra-means "four".

I’m Sarah. I’m twelve years old, My school is not far from my home. I usually walk to school with my friends, Jane and Cindy. It’s about fifteen minutes’ walk. Sometimes we ride our bike to school. The bike ride only takes about eight minutes to school. We like riding the bike. It’s good exercise.

Rick is my brother. He’s a middle school student. It’s about thirty kilometers from our home to his school. He always takes the subway to school. The subway comes at a quarter past seven and he gets to school at a quarter to eight. He loves to take the subway because the subway ride is never boring. He always talks with his friends. And he can listen to many nice songs.