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Save the world's trees

    "When it comes tothe Earth, there is no time to waste." says the Earth Day Network. And that isright. Protecting our environment is very important, and World Earth Day wascreated in 1970 to ask more people to protect our environment. On April 22, peoplearound the world celebrate Earth Day.

Every year thereis a special topic, and this year it is "Trees for the Earth", so Earth Daythis year will be all about planting trees. They are planning to plant 7.8billion trees within the next five years.

That's a biggoal, and you might wonder why trees are so important. Because they can take incarbon dioxide (CO₂) and protect the air quality(质量). CO₂ isa chemical in our atmosphere, but humans make too much of it. Each person makesabout 2.3 tons a year, which is bad for the environment.

Well guess what!Planting new trees is important because people cut down a huge number of trees.Last year, there were 3 trillion trees in the world, about 139 billion inChina. But according to China Daily, the world's total number has been almostcut in half since human civilization(文明) began. That's because 15billion trees are cut down every year.

So we need toplant more to make up for（弥补）the ones we lost. One treecan take in 21. 8 kilograms of CO₂ per year. And it's still one ofthe cheapest and best ways to get rid of CO₂.

    But don't forget that we can also help the environment by cutting down on how much energy(能源) or water we useevery day. Every little thing helps.

根据短文内容，回答问题（1-4），英译汉（5）。

    As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger.

    Scientists have found out that radiation(辐射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of radiation from the sun and other stars, which is bad for their health. Some special medicine may work a little, but there's no really helpful medicine.

    Space junk is also thought a great danger to spacemen. It's reported that there are 9,000 man-made things flying in space. About 30% of these are man-made satellites(卫星),10% are spaceships, and the rest are space junk. An explosion(爆炸) in 1996 made a cloud of 300,000 fragments(碎片), each at least 4 mm in size, and even a small piece of these knocked against a spaceship window and did some damage. Scientists are working on helpful ways to do with space junk.

    Although space is really dangerous, it interests everyone on the earth. In the near future, it may become usual for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space for a few years. So we should care for space and do something to help improve the space environment.

    When throwing away rubbish, do you know which Bin it should go in? Have you ever noticed the differently-colored Bins on the street?

    Some of you might not be able to answer this question. However, it's actually quite important to know how to sort your waste. Not knowing how to sort waste can make it harder to save energy and protect the environment.

    If you don't sort your waste, all of it will go to a landfill and Be Buried(埋) together. These landfills can take up large areas of ground that could have Been used for planting trees or Crops. The electronic waste you throw away, such as Batteries, Can pollute the soil and groundwater. Other pieces of waste, like the metal part of a pen, can be used to make other things if they are properly recycled.

    With this in mind, many Cities in China have Been running waste-sorting Campaigns (活动)in recent years. For example, Shanghai announced in July that within three years, all of its residents(居民)should sort their waste into four groups wet, recyclable, harmful and dry.

   "Wet" waste is also known as household waste." They are things you don't want but that pigs can eat," Guangzhou Daily explained. Paper, metal, glass and other things that Can Be reused are recyclable waste.

    Harmful waste includes things like medicine, Batteries and fluorescent Bulbs. Finally, any waste that's not wet, recyclable or harmful will go in the" dry waste" bin.

    Many other Chinese Cities, including Shenzhen, plan to use this method to sort their garbage. Now that you know this, perhaps you can do your part to protect the environment and encourage others to sort their waste.

    Do you want to know what our life will be like in the future? Let's have a look. You may get a surprise.

    You will go to the kitchen when you are hungry. You will give orders to the kitchen robot. The robot will find a special food for you in a few minutes. Then it will bring it to you.

    In the kitchen you will find a special food machine. The food machine will tell you what your body needs. It will help you eat healthily. The food machine will be connected with (连接) the kitchen robot. The robot can get messages from the food machine.

    After having a meal, you can go to your home office. You will work at home and you don't need to go out to work anymore. You will have a special information screen. When you receive a message from a friend in America, your information screen will be turned on automatically(自动地). Your friend's face appears on the screen. Then you can talk to your friend easily.