Why do plants grow in some places and not in others? Why does some land have so many plants growing on it, while other land has almost no plants growing on at all?

    To grow, plants need some things. One is warmth. In very cold places, almost nothing grows, Plants also need water. In very dry parts of the Earth, only a few unusual plants can grow. That's why dry deserts(沙漠）almost don't have trees or grass.

    Plants must also have a place in which to put down their roots（根）and grow. They find it difficult to grow on hard land. The town is on hard land. The plants here can only grow in the soil（土壤）between the cracks of the stones.

    Another thing plants must have before they can grow is food.

    What will happen if we try to make things grow on the sandy（有沙的）beach? A few plants, such as beach grass, will grow in sand, but most plants won't. Even if（即使）the weather is warm enough and we water the plants each day, many of them will die because the sand on this beach has almost no food for plants.

    In 1969, humans landed on the moon for the first time. Now, many other countries want to go there as well. Why?

    The moon has a lot of minerals (矿物质) and other useful things. We want to find out if we can use them. The moon is our closest neighbor in space. We can use it as a rest station. Then, we can learn more about other planets far away in space.

    The moon is 3,474 kilometers in diameter (直径). It is about one-fourth the size of Earth. If Earth is the size of a basketball, the moon is the size of a tennis ball.

    The moon has much less gravity than Earth. If you can jump 1.5 meters on Earth, you can jump 9 meters on the moon.

    The moon is very quiet. There is no sound there. There are a lot of grey rocks on it. The moon's sky is always black.

    Our moon is about 384,400 kilometers away from Earth. The total length of the Great Wall is about 21,200 kilometers. We would have to put about ____ Great Walls end to end to reach the moon!

Do you like travelling？Travelling is one of the most popular activities during holidays. Modern traffic develops fast，so travelling to different places gets much easier than before. 

Travelling can keep you healthy，and can make your trip happier. But do you know how to keep healthy during a trip？The following information may be useful to you. 

Before leaving

★Wear comfortable shoes，a hat and sunglasses. 

★Take some necessary （必需的） medicines with you. You will need them when you get sick or have other problems. 

★If you do lots of sports like walking or climbing during your trip，you should do some exercise for weeks or months before you leave. While travelling

★Be sure not to eat dirty food or bad fruit. 

★Have enough time to take a rest during your trip. 

★Tap （水龙头） water is not safe，so drink bottled water. When you drink it，remember to clean the cover of the bottle. There may be something dirty on it，such as dust （灰尘）. 

This is a picture of a cartoon film（电影）. The1 name is Chang An. Chang An is the capital2 the Tang Dynasty（唐朝）. It is big and rich. The film is about Li Bai and3 friend Gao Shi. They are great China's poets（诗人）. Li wants to be4 officer. But he can't5 it because his father is a businessman. He likes to have parties, and he writes6 poems（诗）when he drinks. Gao Shi wants to be an officer too, 7 he doesn't like parties. They both work hard for their dreams.

In the film, 8 48 poems. Many children watch the film9 their parents. They10 it very much. They say, "we learn history and poems from the film!"

In China, safety education is becoming more and more important now. The last Monday in March is for students to learn it at school. It helps students learn more about what they should do to keep themselves safe. What are the accidents at school? Take a look.

Stampedes(踩踏), earthquakes and fires are the main accidents at school.

A stampede always happens in crowded places. When students around you begin to push, just stand there and try to hold something. If you fall down in the crowd, move to one side and protect your head with your hands around.

When earthquake happen, you can get under a desk quickly and hold on. It will protect you from falling things. If you are outdoors, find a place away from buildings, trees and power lines.

When there's a fire, leave the classroom quickly. It's better to put something wet over your mouth and nose. In this way, you won't breath in smoke. Many people die in the fire, not because of the fire but smoke. It makes them cough and they can't breathe. That's very dangerous! So when you want to get out, you should make yourself close to the floor. Then you can breathe some fresh air.

要求:至少5句话(短文的开头和结尾已给出，不计入总句数 。 参考词汇:喜欢like；最喜欢的favourite