There are millions of different animals in the world, but some are in danger, and some may soon die out. People can never see them again. Mark and David wanted to find some of these rare animals, so they climbed mountains, crossed rivers, and walked through rainforests.

    A Bat, a Cat or a Squirrel?

    Mark and David found the aye-aye. The aye-aye has bright eyes. It has ears like a bat, a body like a cat and a tail(尾巴) like a squirrel. Some people think the aye-aye brings bad luck. They killed(杀死) many of them, and cut down a lot of trees where the aye-aye lives as well.

    A Strange Parrot

    Mark and David found the biggest parrot in the world that cannot fly. Many years ago, some animals came to the place the parrots lived in, and killed many of them. Now there are only a few left.

    Another Special Animal

    Mark and David went looking for a manatee. A manatee looks like a seal and a hippo. In some places where manatees live, the water in the river gets low. Then the manatee swims to the place where there is more water. Many get stranded(搁浅), and some are killed by other animals and people, too.

    After Mark and David returned, they made a film about these animals. They want to show the world these strange but interesting animals. They want the world to know there are not many of them left, and they all have a place in our world.

    Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood.

    Unluckily, in many parts of the world, man has not found that the third of these points is the most important. Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And also, he is usually too careless to plant and look after new trees. So the forests slowly disappear.

    This does not only mean that man will have fewer trees. The results are even worse: for where there are trees, their roots break up soil make the rain in——and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-oil. When all the top soil is gone, nothing is left but useless desert.

    Scientists think that there has been life on earth for millions of years. However, we haven't found life on other planets yet. The earth is a planet and it goes around the sun. And there are seven other planets that also go around the sun. The sun and its planets are called the solar system. The solar system is a small part of the universe.

    Scientists have launched many spaceships to explore other planets in the solar system. Some spaceships have gone beyond the solar system. However, no one has discovered any life in space yet.

    Why has no one from other planets sent us a message? Have they tried to send information to us? With so many stars in space, are we alone, or is there life on other planets in space?

 There are about 180,000 words in the Oxford English Dictionary, but most of us only know a few thousand of them. That's why we often want to get the answer of" how to improve vocabulary". Here are some ways to improve your vocabulary.

Watch English movies

 Watching the English movies is a vocabulary booster. If you see the movie of your favourite book, you will have a better understanding of the words in it. You read something and then you see it on the screen. You will remember better because you have a visual representation.

Get out of the house

 Going to new places and doing something new are great ways to build new knowledge. When you open your eyes to new people and things, you also get new words from them.

Join a book club

 In a book club, you have to spend some time reading. Read as many kinds of books as you can and you will learn more new words in different areas. Don't forget to write the new words down. Try to remember and use them.

What if you don't know how to study well? The Feynman Technique might help you. It's a study method that helps students learn by teaching others. 

The Feynman Technique has been one of the best study methods for years. For one thing, it helps students really understand something instead of just memorizing information. Different from traditional study methods like re-reading textbooks or reviewing notes, it gets students to be more active in the learning process. 

If you want to use the Feynman Technique to study better, follow these steps. 

To begin with, choose a topic you want to learn. If not, you'll end up jumping between the topics without developing a deeper understanding of any of them. 

The second step is the heart of the Feynman Technique: explaining the topic simply enough to be understood by a sixth-grade student. This requires you to help the child understand by using the simplest and clearest language. This step helps divide indigestible topics into their most basic parts. 

Next, review your explanation and try to find any area where you felt that you couldn't explain the topic simply. When possible, it can be very helpful to get advice from someone whose understanding is similar to that of a sixth-grader. 

The fourth step is to improve your explanation using the information collected from the third step. 

Finally, repeat the steps. The Feynman Technique works best with repetition, and that is why going through all the prior (先前的) steps just once is usually not enough to fully understand the topic. 

Once you're confident you have learned the topic, it's time to give yourself a prize