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    Have you ever stayed in a hotel? Most Chinese hotels often provide guests with things like disposable (一次性的) toothbrushes, toothpaste, shampoo and slippers. Many guests like the idea because they don't have to bring their own. But, if you travel to Beijing, remember to bring your own things. Starting from June, some hotels in Beijing will no longer provide guests with these disposables. They want to ask people to use less disposable things.

    Many disposable things are made of plastic. People throw them away after only using them once. It is a waste of natural resources (资源) and is very bad for the environment. Do you know, one Chinese person makes as much as 400kg of waste a year! Most of that waste comes from disposable things. In Beijing, people throw away about 19,000 tons of plastic bags and 1,320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel, bring your own things and use them again and again.

    Back at home and school, you can also do something to make our world a better place. Try to do these things in your daily life: Use cloth shopping bags, not plastic ones. After using a plastic bag, wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school canteen（食堂）, use your own bowl and chopsticks instead of disposable ones.

    There are all kinds of animals on our planet. Some are sweet, but some are not; some are small, and some are tall. Here are four pictures of some of the funniest, friendliest faces. But remember, although they look nice, it doesn't mean they are always friendly.

    Not all dogs are so cute, but most of them are pretty friendly. When you come near an unfamiliar(不熟悉的) dog, remember to hold out your hand, so he can smell you and see that you mean no harm.

    Cows love to eat grass, and they eat quite a lot! You needn't be afraid of this quiet farm animal. But don't run at a cow in a field or touch one, unless you are told by an adult it's okay.

    Horses are big, beautiful animals, but they can be easily angry. A horse might jump up if she hears a loud noise, or kick her legs if you come near too suddenly. All horses, like humans, are different.

    Chimpanzees(黑猩猩) make funny faces and put on a real show at the zoo, but believe it or not, they can be very dangerous. And they are strong too--much stronger than humans--so you should never make a chimp mad!

    What does it mean to be green? "Green" is more than just a color. It also means taking special steps to protect the environment — the water, the land, and the air we breathe. Why green? Plants are green, and without them the earth wouldn't be such a lovely home for us human beings.

    Sometimes people call our society a "throwaway society". That means we are always throwing away old things and buying new ones. Many times, if you no longer need something, someone else just might need it. For example, if your brother is old enough not to play with his plastic bike, why not give it to another family who has a little kid so that they don't need to buy one? And one less large plastic toy doesn't need to be produced.

    Recycling （回收利用）has never been easier. Many organizations will pick it up right in front of your house and some towns even require （要求）it. Tell your mom or dad you want to become "Chief of Recycling" for your family. Now that you know what things you can recycle, find a place to keep them. Make sure you encourage everyone in your house to think whether things can be reused or recycled before they're thrown away.

    Almost everyone likes traveling. But next time before you travel around the world, take a look at your own backyard. Is there a place where you could plant a tree or put in a little fruit or vegetable garden? If so, get there and get your hands dirty. Then you can watch with pride as your tree takes root, and your garden plants grow into big plants full of ripe, red tomatoes or tiny, juicy blueberries. Who knew being green would taste so good?

    The best time to collect green leaves is early in summer but not so early. The months of June and July provide the best leaf samples (样本) but you can find great leaf samples throughout the summer. To make a full colour collection, you have to collect leaves in autumn. I have seen many beautiful fall colour collections.

    When you select leaves for your collections, try to select leaves of about the same size and shape on the tree. Make sure you should collect the complete leaves.

    Remember, simple leaves have only one blade (叶片) or leaflet. Compound leaves have several or many leaflets. You must know these two kinds of leaves. Good leaf collections contain the entire leaf. That is a small part of the twig (嫩枝) with a lateral or terminal bud (芽).

    When you collect leaves in the field, you can place them between the pages of a magazine to protect them. And then, press them as soon as possible before you remove them from this magazine. You should dry the collected leaves carefully before placing them in a leaf press. Finally, place them in a leaf press. You should write down each leaf's name and these names should follow the leaves until the exhibition comes.

    We can see walls everywhere in the world. But the Great Wall of China is the biggest of all. The Chinese call it "The Ten-Thousand-Li Great Wall". It is in fact more than 6000 kilometers long. It is 6～7 meters high and 4～5 meters wide. In most places, five horses or ten men can walk side by side along the top.

    When you visit the Great Wall, you can't help wondering how the Chinese people were able to build such a great wall thousands of years ago. Without any modern machines, it was really very difficult to build it. They had to do all the work by hand. It took millions of men hundreds of years to build it.

    The Great Wall has a history of over two thousand years. The men began to build the first parts of it around two thousand seven hundred years ago. Then QinShihuang had all the walls joined up. He thought that it could keep the enemy out of the country.

    Today the Great Wall has become a place of interest. Not only Chinese people but also people from all over the world come to visit it.