Sharks(鲨鱼) are the most frightening animals in the sea. Sometimes we can see sharks swimming in the sea around Hong Kong. People put nets around some beaches to protect swimmers. When there is a "shark's flag", people must stay on the beach. It will be too late if a shark can swim sixty kilometres an hour to you.

    There are 30 kinds of sharks and 25 kinds of them are dangerous. The whale sharks are, very big. They can grow to 18 metres long, but they are not dangerous to people. The jaws(大白鲨) and the tiger sharks are the most dangerous kinds of sharks.

    Do you know all sharks must keep swimming, or they will go down?

All sharks can feel everything that happens around them. We must keep calm and don't make any noise when a shark is swimming near you.

    If a shark loses a tooth, a new one will grow out very quickly. So sharks always have many sharp teeth.

    Cycads(苏铁)grow in warm places. They are tall and green all year round. Their leaves grow on the top and flowers seldom come out. Some have bright orange fruits. They usually need hundreds of years to grow into adult plants.

    Cycads are facing problems now. In South Africa, the situation of cycads is getting terrible, but this has drawn little attention from the public. "In fact, there are 38 kinds of cycads in South Africa. Among them, 2 kinds have disappeared since 2003 and 25 kinds are in great danger," said a gardener. "Do you know what the loneliest plant is in the world? It is Wood's Cyead. Someone found it in a forest in 1895. It is the only one of its kind."

    So what causes cycads to be in danger? Surprisingly, the danger is from the people who love them most. These slow-growing adult cycads even sell for tens of thousands of dollars each. As time goes by, they have become a symbol(象征)of wealth and position(地位)in society. This makes cyead lovers want to own more. Cyead lovers buy and plant them in their private gardens. As a result, nearly all these cyeads die because the living conditions have changed.

    Recently, South African government has taken some actions to protect cycads from being stolen traded. At the same time, people around the world should also work together to protect the plants.

    Different weather makes people feel different. It influences(影响) health, intelligence(智力) and feeling.

    In August, it is very hot and wet in the southern part of the United states. People there have heart trouble and other kind of health problems during this month. In the northeast and the Middle West, it is very hot at some times and very cold at other times. People in these states have more heart trouble after the weather changes in February or March.

    The weather can also influence intelligence. For example, in a 1983 report by scientists, IQ of a group of students was very high when a very strong wind came, but after the strong wind, their IQ was 10% lower. The wind can help people have more intelligence. Very hot weather, on the other hand, can make it lower. Students in many schools of the United States often get worse on exams in the hot months of the year(July and August).

Weather also has a strong influence on people's feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have a hard time in hot summer. At about 18℃, people become stronger.

Low air pressure(气压)may make people forgetful, People leave more bags on buses and in shops on low－pressure days. People feel best at a temperature of about 18℃. Are you feeling sad, tired, forgetful or happy today? It may be the weather's problem.

    It's hard to make friends if you stay at home all the time, so get out of the house and do things that will put you in touch with(接触)other people. It's easier to make friends with them when you find you like the same things as other people.

Don't be afraid to show people what you're really good at. You can talk about the things you like and do best. People will be interested in you if they, hear something interesting about you.

    Look at people in your eyes when you talk to them. That way, they'll find it easier to talk to you, or people may think you're not interested in them and may stop being interested in you.

    Be a good listener. Let people talk about themselves before talking about "me, me, me” You can ask people lots of questions and show that you are interested in their answers.

    Try to make friends with the kind of people you really like, respect(尊敬)and admire(羡慕). You shouldn't just make friends with those people you will meet them easily. Try to be friendly with all kinds of people. That way, you'll have a bigger group of people to choose from. Then you'll be easier to make friends with other people.

As a kind of traditional Chinese dress, Ma Mian Qun( horse face skirt) first appeared in the Song Dynasty and grew popular during the Ming Dynasty. The two sides of Ma Mian Qun are pleated(起褶的), and there isa smooth part in the middle, commonly known as " Ma Mian".

Why is it called " Ma Mian"? In fact, " Ma Mian" is a kind of structure(结构) used for protection in the city wall system. However, all the books about Ma Mian Qun only show that the smooth surface without pleats in the middle is called " Ma Mian". But there is no further explanation of how Ma Mian Qun got its name.

Ma Mian Qun is colorful, mostly red and blue. Red means good luck and joy. According to Han customs, women usually wore red skirts during celebrations of festivals. In the Qing dynasty, blue was also common and popular, paired with black and yellow.

Ma Mian Qun has different kinds of patterns with different meanings. For example, dragon and phoenix patterns show the love between a man and a woman or a beautiful marriage. Peony(牡丹) is a symbol of wealth and honor.

Recently, Ma Mian Qun has become a popular form of skirt for Hanfu fans. More and more modern fashion designers find ideas from Ma Mian Oun. For example, some get ideas from the patterns. Some combine(结合) the styles of Ma Mian Qun with T- shirts or blouses, which are more suitable for everyday wear. Even western fashion has been influenced by Ma Mian Qun for many years.

Liu Shuangrui, a 15-year-old boy from Liaoning, started to wear glasses at the age of 5. Twenty-five of 38 students in Liu's class wear glasses. Does this sound anything like your class? In fact, about 60 percent of Chinese teenagers are near-sighted (近视的). China has the world's most near-sighted people: the number of near-sighted people became 700,000,000 in 2021, and now it's even larger.

"This is mainly because of the overuse of the eyes when people are studying or working," Wang Ningli, head of a famous Beijing hospital once said. Now, many young people spend lots of time looking at computers or phones every day.

Many people know that reading in the dark light is bad for one's eyes. They try to read only under bright light. However, if the light is too bright, it can also have bad results for one's eyes.

Eating too much candy can do something bad for your eyes as well. Too much candy will result in losing vitamin (维生素) B1. Vitamin B1 is very important for your eyes.

It's not so hard to save eyesight as you expect. Almost everyone can try the following advice.

·Follow the 20 rule. Every 20 minutes, look away from computers or phones you are using. Try not to put them too close to your eyes. Keep your eyes at least 20 cm away from the screens or the desks when you work or study.

·Do some outdoor activities every day.When you are outside, look at things far from you. In this way, your eyes can get relaxed. And getting more sunshine will be useful for your eyes.