There are many kinds of food in the world. Scientists know a lot about them. They say that there are some kinds of food people must eat every day. For example, people must eat some green and yellow vegetables. We shouldn't eat too much meat. People also need to eat some fruits, bread and rice. Of course our bodies need some water and milk.

    Scientists say people in different countries and different places eat different kinds of food. They cook food in different ways. Different people eat at different times. In one place, people eat once or twice a day. But in another place, people eat three or four times. The scientists say when to eat and how many times to eat are not important. What we eat is the most important thing.

    Nowadays, the world faces two problems. People in some places, for example, in Africa, are not full. Many people are eating junk food. It's bad for people's health. So it's our duty to make everyone full and make everyone healthy.

    When some plates(板块)of the Earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the Earth. They often happen near the mountains.

    During an earthquake, the shakings make rocks rise suddenly and even crack(断裂) open. Houses fall down. People are killed or hurt, and sometimes the whole villages or cities are destroyed.

    Can we do something to keep ourselves safe from earthquakes? Scientists have studied earthquakes and made maps that show the “earthquake belt（带）”. In area of these belts, it's possible for earthquakes to happen. In these areas we should build strong houses to fight against earthquakes.

    In the future, Scientists will be able to tell when and where an earthquake will attack before it happens. They can also tell people what to do and how to deal with it.

    My mother used to ask me what the most important part of the body was. I got different answers at different ages.

    When I was young, I thought sound was very important to us, so I said, "My ears, Mum. "But she shook her head and said no. Several years passed, and she asked me again. I believed that I got the right answer after thinking it over. So I told her，"Sight is very important to everyone, so it must be our eyes. "But she told me I was wrong. I tried many times after that, but her answer was always the same. Till last year, my grandma died. Everybody was crying, and everybody was hurt. My mom looked at me and asked me with tears in her eyes，"Do you know the answer now？"I was surprised when she asked me this question then. "My son, the answer is your shoulder. Everyone needs a shoulder to cry on. "

    Finally, I realized (意识到)all she hoped is that I can have enough love and friends so that I will have a shoulder to cry on when I need it.

    What's sleepwalking(梦游)？Sleepwalking usually happens in the first few hours of sleep. Not all sleepwalkers walk when they are sleeping. Some just sit up or stand on the bed. Some even get up and walk around for a few minutes or half an hour. Some do things as if they were awake, but in fact they are not!

    Sleepwalkers' eyes are open and they usually go back to beds by themselves. But they won't remember it the next morning.

    About 15% of kids sleepwalk. Sleepwalking sometimes happens when a person is ill or worried, or doesn't get enough sleep. If sleepwalking happens often, you should see a doctor. If it doesn't, you don't need to worry. Here are some ways to help stop sleepwalking:

    Listen to some music and relax before going to bed.

    Go to bed at a regular time every night. keep your bedroom quiet and dark when you try sleeping.

    Don't drink a lot of water in the evening and be sure to go to the bathroom before going to bed.

The Giraffe

    The giraffe is the tallest modern land animal. It can be over 5. 5 meters tall. Its neck bone may be 1. 9 meters long. Yet the giraffe has only seven bones in its neck, the same number as in the human. Even a small bird has many more bones in its neck than in a tall giraffe. Each bone in a giraffe's neck is very long, while the bones in a human's neck are small. That makes the difference. A female giraffe gives birth to one baby at a time. The baby, called a calf, is about 1. 9 meters tall at birth. By the age of eight it is full-grown. The giraffe can live for 30 years; the giraffe is good at running; it can run 30 kilometers per hour. The giraffe likes to live together, usually 7~10 a group. The giraffe eats mostly leaves. Because it has a long neck, it can reach the leaves high up on the trees.