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   Cats are the most popular pets among Americans. So it is not surprising there are many expressions about cats. Do you know any of them? Now let me introduce some to you.
   Some cats like to catch small birds, like canaries. If someone looks very proud or satisfied with himself, we say he looks like the cat that ate the canary.
   Sometimes, a cat likes to play with a small animal it catches. So if you play cat and mouse with someone, you change between different kinds of behavior when dealing with another person. For example, a child might offer something sweet to her little brother, and then take it away when reaches for it.
   A cat will often catch a small animal and present it to its owner. The saying “that looks like something the cat dragged in (把…拖进来)” describes something in bad condition.
   A fat cat is a person with a lot of money.
   There are many other expressions about cats in America. How interesting! Which kind of cat are you, or which kind would you like to be?

    When the weather is hot, you go to a lake or an ocean. When you are near a lake or an ocean, you feel cool. Why? The sun makes the earth hot, but it can not make the water hot. Though the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth goes up, then the cool air over the water moves in and takes the place of the hot air. When you are near a lake or an ocean, you feel the cool air when it moves in. You feel the wind and the wind makes you cool.

Of course, scientists cannot answer all of our questions. If we ask "Why is the ocean full of salt?" scientists will say that the salt comes from rocks. When a rock gets very hot or very cool, it cracks (崩裂) , and rain falls into the cracks. The rain then carries the salt into the earth and the rivers. The rivers carry the salt into the ocean. But then we ask "What happens to the salt in the ocean? The ocean does not get saltier every year." scientists are not sure about the answer to the question.

    We know a lot about our world. But there are still many answers that we do not have, and we are curious(好奇的).

    Zhalong is a nature reserve in Heilongjiang in northeast China．It is one of the world's most important wetlands．The area provides food and shelter for wildlife．It is an ideal home for different kinds of plants，fish and birds．

    Many birds live comfortably in Zhalong Nature Reserve all year round，while some only stay for a short time．There are many fish in the wetlands，and the birds can easily catch them for food．Zhalong Nature Reserve is an important living area for the rare red-crowned cranes．There are not manyred-crowned cranes in the world．Some of them live in Zhalong．

    Some people want to change the wetlands to make more space for farms and buildings．This means that there will be less and less space for wildlife．

    More and more birds are in danger because they do not have enough living space．Many of them died．The Chinese government wants to protect these endangered birds，and they can be safe in Zhalong．

    Every year a lot of tourists go to Zhalong to watch birds．This year members of ourBird watching Club are going to study the different kinds of birds in Zhalongand the changes in their numbers．The study begins next month．

    We do a bird count once a year．We are now inviting secondary school students to help．We need more people to help us count and do something to help the birds．Many people do not understand the importance of the wetlands．We hope this information will help them understand and make them actively take action to protect wildlife．

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