In nature, you may see many insects(昆虫) and animals of different colors. Have you ever wondered why?

    Locusts are super delicious food for birds, but it is not always an easy job for birds to catch them. It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors, of locusts change with the colors of crops(庄稼). When crops are young, locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.

    Brown bears, tigers and other animals move quietly through forests. They can't be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark colored and they live under the soil(土壤)in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive, they have to hide themselves in the daytime and appear only at night.

    Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over, its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all.

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    The Earth is our home; we must take care of it. This means keeping the land, air and water clean. Pollution is a dirty word. To pollute means to make things unfit or unclean to use. Pollution comes in many ways. We see it, smell it, taste it and drink it. Pollution is beginning to threaten (威胁) our health, our happiness and our life. Man has been polluting the earth from the time he first made fire, washed his clothes in the river and threw his waste on the ground. When land was used up or water became dirty, men moved on to another place. At first, the problem was not so serious because there was plenty of clean air, land and water. There weren't so many people then and their wants were fewer. All the dirty things could be absorbed (吸收) by nature and soon covered over. But this is no longer true. The increase of population and the development of industry(工业)have changed that. Man is slowly poisoning (毒害) his environment. Through the use of poison, man has polluted the land, killing the animals. By putting dirty water and chemicals into rivers and lakes we have polluted our drinking water, killing the fish.

    Our increasing population is part of the problem. More people, more waste.

    Where is this all to end? Are we turning the world into a big rubbish dump (堆存处), or is there any hope that we can get rid of (摆脱, 除去) the pollution? Luckily, millions of people have been warned of the danger of pollution. Large numbers of people are now working hard to bring pollution under control.

    As we know,more and more teenagers are beginning to somke.It seems that young people think smoking is very cool.There are many reasons for this,for example,films.Many actors smoke in the films and this can lead teenagers to think smoking can be cool.Many young people believe that smoking makes them look cool.It's probably true that smoking helps them look older.Doctors say that not only sugar and alcohol but also smoking is bad for your skin.Do you really want to see wrinkles on your face at a young age?Do you really think that smoking will make you as cool as you think?Do you really believe that he or she will like someone that smells like a factory?This is simply a bad idea.Besides causing cancer,smoking will also make you ugly and sad.

    Therefore,boys and girls ,forget about smoking!Don't even start.If you are smoking,give it up as quickly as possible.Why not live a healthy life without smoking?

    Do you know the way of using wind power to make electricity? There are many advantages({优点) of using wind to make electricity. Here're some of them.

    First, it may be one of the cheapest ways to make electricity. Second, it can make and store hydrogen gas. The most important one is that it won't pollute the environment. Besides, the wind power can be reusable.

    But large wind farms might kill birds too, because birds always fly into the wind turbine(风力涡轮机). Scientists are looking for ways to stop it.

    Experts said that by the middle of the 21st century, wind power could supply more than 10% of the world's electricity. Wind really helps us a lot.

    Every day there is less and less space on Earth for rubbish. Yet every day we make more and more rubbish. What can we do? We can recycle some of our rubbish. Recycling means that the rubbish will be made into something that can be used again.

    Recycling helps Earth. And it saves space in rubbish dumps. Half of everything that we put into landfills could be recycled instead. In fact, most things made of paper, metal, glass and plastic can be recycled.

    Paper can be broken into small pieces and made into new paper. Steel and aluminum cans(金属雄)can be melted down(熔化)and made into new cans. The same is true of glass bottles. This can be done over and over again. Recycling doesn't take as much energy as making these things the first time. So we can use less of Earth's fuel resources.

    Plastic can be melted down, too. Then it can be formed into park benches, playgrounds and so on. Some people call plastic the "wood" of the future. Things made of plastic will last about 400 years-even if they stay outside in the weather. No wood can do that!

Have you ever seen the film Forrest Gump (《阿甘正传》) ? There's 1 famous saying in it: "Life is like a box of chocolates. You never know 2 " The surprise is part of the fun. It is not only from the chocolates you find in the box but also the process of opening the box. Now blind box toys have become very popular since they 3 to China. Blind box toys are hidden inside the same packaging. So, the buyers don't know what is in the boxes until they open 4 . The most popular toys in the blind boxes are cute characters that come 5 pop movies, comics and cartoons. There 6 a few special ones in many common boxes. "Maybe the next one is a gold toy. My wish is 7 another box." said one buyer. As a result, people will open more blind boxes and hope for a better result. 

Besides expecting good results, people also enjoy the surprise and uncertain mysteries. "Opening a blind box like opening a birthday gift is an enjoyable surprise for our simple daily lives," said a 8 girl. "When I open these simple little boxes, I feel disappointed at one, but I feel 9 at another." A fear of the unknown is always a part of the box-opening process, and waiting for the uncertainty is 10 part of the fun.