A river is a flowing（流动的），moving stream of water. Usually a river feeds water into an ocean，lake，or even another river. Rivers can differ in size and there is no strict rule on how big a flow of water must be to be called as a river. Here are the five longest rivers in the world.
| The Nile River The Nile River is 4，135 miles long. It is located（位于） in the continent（大陆），mostly in the countries of Egypt and Sudan. It flows north into the Mediterranean Sea. |
| The Amazon River The Amazon River is 3，980 miles long. It is located in the continent of South America and flows through several countries including Brazil，Venezuela，and Ecuador. It ends at the Atlantic Ocean. |
| The Yangtze River Located in China，the Yangtze River is 3，917 miles long and flows into the East China Sea. |
| The Mississippi River and the Missouri River The river system of the Mississippi River and the Missouri River is the longest river system in North America at 3，902 miles. It flows south into the Gulf of Mexico. |
| The Yenisei River The Yenisei River starts in Mongolia and flows through Russia to the Kara Sea in the Arctic Ocean. It's 3，445 miles long. |
There are 76 rivers in the world over 1，000 miles long. A lot of people think that rivers always flow south，but 4 of the 10 longest rivers in the world flow north. The United States alone has around 3. 5 million miles of rivers. Four of the top 10 longest rivers flow through China at some point.
Like subway systems all around the world，there are two main rules on the London Underground —Please mind the gap（缝隙） and please give up your seat for someone who needs it.
But London's 160﹣year﹣old subway system is special because it also has two unwritten rules —never make eye contact and don't get too close to the other passengers. If you do any of these things you will break the balance，and the whole carriage（车厢） will give you unfriendly stares.
On the "tube"，as it is known in England，people do not talk to one another，they will look away faster than you can say sorry，this is their way of being polite. A certain space is also kept between passengers. In crowded carriages，so the carriage looks full when actually there is plenty of space.
Considering personal space，finding a seat on a crowded train is no easy task. Some people in England have created websites to explain how to get one. If you are lucky enough to nab（抢夺） one or find yourself sitting in one of the few special seats. However，so you can't win.
Sometimes the train driver will make a joke over the loudspeaker，saying something like， "How is everyone going on？" and the train tension（紧张），and no touching.
Dong Yuhui，a 30﹣year﹣old livestreaming（直播） host for East Buy（争议） that began on Dec. 5
East Buy said that many of the things Dong said in his livestreams were written by the East Buy team，not by himself. The then﹣CEO，Sun Dongxu，which made Dong's fans upset.
Surprisingly，this controversy made Dong even more popular. In just one week，his Douyin followers increased by over 3 million，and Dong became vice president of New Oriental's cultural and tourism business.
Though his fame is rising，Dong remains humble. "I am not good﹣looking or tall；I don't know why I have so many supporters. " he said.
However，Xu Hanze，an associate professor at Nanjing University of Aeronautics and Astronautics（南京航空航天大学），thanks to his habit of reading widely.
In the age of consumerism（消费主义），Dong does not trick customers into buying unnecessary products，but encourages them to think twice when shopping online. He also puts more efforts into educational activities and events to help farmers.
Dong believes that people should not wish to be the next Dong Yuhui. He said， "I want to tell other young livestreamers that they do not need to be me，as each story is moving in its own way. " He went on to say that people are not the same products（不同） is what makes people special.
With everything that's going on in the world，it's no wonder many of us have sleep problems. It's normal at night，especially when stress is keeping you up. For example，set the comfortable temperature and turn off screens 30 minutes before bed. Here are some easier ways for you.
Test your pillow. If you bought your pillow in 2020，it's already old. Experts suggest buying a new one instead. If not，it can cause neck pain. When your brain senses the pain，you can't sleep well.
Get an hour of sunlight each day. It tells your brain that it's time to be awake. It also makes you feel fresh in the morning. It's necessary to get about 30 minutes' direct light and two 15﹣minute outdoor breaks during the day. And the sunlight is helpful to have a good sleep at night.
In a study，researchers followed 321 patients with high﹣salt food and sleep problems for 12 weeks. "More salt woke up people more often to go to the bathroom at night，" one researcher says. "When people cut down on salt
Deal with your troubles before dinner. If you need to do with your troubles，don't wait until night. It's better to solve them before dinner. Sharing them with friends is a good way. Going to bed peacefully makes you sleep better and sounder.
A. Keep salty snacks away before bed. B. Simple steps can help you sleep well. C. Good sleep can help you keep healthy. D. You'd better replace it every one or two years. E. Morning sunlight is useful for good sleep. |
At home，my family has seven chickens. I gave them all names，and they are my good 1 . You may think that taking care of chickens is easy，but sometimes chickens have minds of their own. 2 you are considering getting chickens，there are a few things you need to know.
Chickens have something we call the pecking order（啄食顺序）. It is the ranking（排位） of 3 the chickens. The order goes 4 the strongest，biggest chicken，to the smallest5 they all eat the same food. Otherwise，you have to keep them apart.
You must pay 6 attention to baby chicks. You need to feed very good food to them，so they stay 7 and become immune（免疫的） to diseases. You also need a place for them to stay in your house and a special feeder and water holder. You can get day﹣old chicks，or you can get chicks that are 6 months and older. Also8 to clean the pen（鸡圈），so neighbors don't complain（投诉）.
You just have to know what you are doing and always be 9 . Chickens can bring families together. They are fun and humorous，beautiful and loving. They are also smart. It's amazing how quickly they learn things 10 their own.
So why not consider getting some of your own feathered（有羽毛的） friends？
Steven Ho and Frank Wang wanted to be （hero）.
"I want people to read about us in the history books，" Steven said， "I want to do something will be remembered forever by people，" "Me，too
The two men thought about this for many weeks，then Steven said， "Let's climb the mountain which is famous for its （high） and steepness（陡峭）. "
"That's a good idea，" Frank said， "but how can we prove that we （climb） it already？"
"We'll put a flag on the top，" Steven said. "Anyone flying over the mountain in an airplane will see it. "
Frank agreed that this was a good idea and the two men set off. They walked three weeks to reach the bottom of the mountain，and then they began to climb. The mountain was very steep and they could climb only a few hundred feet a day. At night they slept in small tent. It was much （cold） on the mountain. While they were climbing across the snow and ice，they suffered from the extreme（极度的），after many days of hardship，they reached the top. "We've made it，" Frank said happily. "We've finally climbed to the top of the highest mountain in the world. We'll （know） and people will remember us. All we have to do now is （plant） our flag in the ice. "
"That's right，" Steven said， "and then we can go home. " He waited for Frank to plant the flag. When Frank did nothing， "Why don't you plant the flag？" "I haven't got it，" Frank said. "I （think） you had it. "
Chimpanzees（黑猩猩） are not only social animals living in communities and work together, but they are smart in many different ways. People have been studying chimps both in the wild and in captivity (圈养) for over 40 years.
In 1960, a researcher named Jane Goodall began to live with and study wild chimpanzees in Africa. She learned that they are highly intelligent animals that communicate with gestures and physical contact. They make tool to find food and they make choices about which groups to join and what foods to eat. In captivity，where they live in zoos and science centers，they can be found in 21 different African countries，living in forests. Chimpanzees are able to adapt（适应）, make new nests，and find new foods. There have even been experiments which show that a few chimpanzees have learned to use computers and to play games!Some scientists argue that chimpanzees can show emotions such as happiness or sadness.
Although chimpanzees are impressive and intelligent animals, they are in danger now and people are destroying their natural habitats. By cutting down tree for firewood and using the space to build houses，humans leave chimpanzees with smaller areas to live in. Fortunately many organizations and researchers have started to take steps to protect them.Everyone should be aware of their work and it is important to help these amazing animals.
Dear Li Hua，
Recently I have read a book about China. In the book，there is an old Chinese saying "Read 10，000 books and travel 10，000 miles. " What does it mean？Would you please tell me about it？
Do you like reading？Could you tell me something about your favorite book？
I hope to hear from you soon.
Yours，
John
要求：（1）要点齐全，并适当发挥； （2）80词左右（开头与结尾已给出，不计入总词数）； （3）文中不得出现真实姓名与校名； （4）卷面整洁，书写美观。
Dear John，
Thanks for your letter. I'm very glad to tell you about the Chinese saying "Read 10，000 books and travel 10，000 miles. "
