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）。

   In thetime it takes you to read this sentence, the population of the Earth will have grownby 10 people. That may not sound much, but it is about 14,000 people an hour. Thatis the same as adding most of the population of Germany to the world every year!

   Most of these new people are born in developing countries. These countriesare found in much of Africa, South America, and parts of Asia. In the developedcountries of Europe and North America, the population is growing very slowly. Thisis because women in these countries have, on average, only one or two children.In the developing countries, many women have five or more children. In 1950, aroundone quarter of the world's population lived in the developed countries. By 2050,these countries will be the home to only around one tenth of the world's people.

   In the developing countries, more than one billion people already live belowthe poverty line (贫困线).These people don't have enough food to eat and they live in poor housing;children get little or no time at school and suffer from many kinds of diseases.

   The United Nations (UN) tries to guess population growth. At the beginningof the 21st century, the world's population was around six billion people. The UNhas said that the world's population will level off at 12. 5 billion people by theyear 2100. Other people think the world's population will continue to grow, reaching14 billion people before it becomes stable or even falls.

AI is now an everyday technology, as common as e-mail or online video. AI is changing how we live. Here are some excellent AI tools in "Time's Best Inventions of AI". 

Everyone is born with the ability to learn. But whether or not you can do this well depends on your learning habits. Research shows that successful learners have some good habits in common. 

Creating an interest in what they learn

Studies show that if you are interested in something, your brain is more active and it is also easier for you to pay attention to it for a long time. Good learners often connect what they need to learn with something they are interested in. For example, if they need to learn English and they like music or sports, they can listen to English songs or watch sports programs in English. This way they will not get bored.

Practicing and learning from mistakes

Good learners think about what they are good at and what they need to practice more. Remember, "use it or lose it"! Even if you learn something well, you will forget it unless you use it. Practice makes perfect. Good learners are also not afraid of making mistakes. Alexander Graham Bell did not invent the telephone overnight. He succeeded by trying many times and learning from his mistakes.

Developing their study skills

It is not enough to just study hard. You have to know how to study. Good learners find out the best ways to learn well. For example, they may take notes by writing down key words or by drawing mind maps. Good learners also look for ways to review what they have learned. They may do this by reading their notes every day or by explaining the information to another student.

Asking questions

Good learners often ask questions during or after class. They even ask each other and try to find out the answers. Knowledge comes from questioning. Learning is a life-long journey because every day brings something new. Everything that you learn l becomes a part of you and changes you, so learn wisely and learn well.

Everyone has problems in their lives. Is there anything you are worried about? What are they? Some people share their experiences. 

Helen: My job is to take care of people's health. I feel satisfied when I see my patients get better. But I'm so busy. I have to get up very early and go back home late, feeling tired. I can't have a good rest at night. 

Mary: I'm a volunteer teacher in a village. It is exciting to work with kids. However, living far from my parents makes me miss them very much. 

Toby: Plenty of second- hand cars are on sale right now. Click my website for them. Don't miss it!

Mike: I've just studied at a new school for a few weeks. My mother keeps telling me to get on well with my new classmates. I know it must be interesting. But it's always so hard for me to talk with them. I start to worry about my life here. 

Jack: The online world is a big part of my life. I keep using the mobile phone all day long. As a result, I can't study well and then get bad marks in exams.