Three kinds of bears live in the United States. They are the black bear, the brown bear, and the polar bear.

    Black Bears

    Black bears are the most common of the three. They live in forests in many different parts of the country. Even though they are known as black bears, they are not always black. Sometimes they are brown or tan (黄褐色的) , and a few are even white. Black bears are usually about five or six feet long, and they are the smallest of the three kinds of bears.

    Brown Bears

    Brown bears are found in a few western states and in Alaska. They live in forests as well as in open areas called the tundra (冻土地带). Brown bears are usually light or dark brown and can grow to be very large. In fact, some are eight feet long!

    Polar Bears

    Polar bears can be found in Alaska. It is in a cold area near the North Pole called the Arctic and there are no trees there. Polar bears are white, and they are the largest of the three kinds of ears. They are a little longer and usually heavier than the brown bear.

    Other Interesting Things

    Bears eat different things. Black and brown bears eat fish and other kinds of meat, roots, and berries. Polar bears eat fish, other meat, seaweed, and grass. All three types of bears eat as much food as they can find just before winter. Then during the cold months, they sleep in caves or hollowed-out trees called "dens". They keep them warm. Winter is when the female bears have their babies. All three types of bears have between one and four cubs (幼兽). The cubs are born while the mother bear sleeps!

    All people are afraid of bears. However, bears are actually shy. Most bears try to stay away from people, but still, bears can be dangerous at times.

Do you know what American students do in class? Here are 1 . American classroom customs.

If the teacher asks you a question, you should give the 2 immediately. If you do not understand the question, you should 3 you hand and ask the teacher to repeat the question. If you do not know the answer, it is all right 4 the teacher that you do not know.

Be 5 time! It is 6 to be late. If you are late, be sure to enter the classroom 7 .Have your books and papers out of your bag before you come 8 the classroom. Then go to your seat and sit quietly. In America, it is not necessary to knock 9 you enter the classroom. Most teachers will give you a low grade if you are often late.

In America, you should call your teacher by his or her last name, not "teacher". Also you should use Mr, Miss, Ms or Mrs. before the 10. This is polite. The teacher will tell you the title that he or she likes.

    Most cars run on gas. Gas cars work very well. But there is a problem. Cars that run on gas make the air dirty. The dirty air is not good for people, animals or trees. Gas cars make the air dirty for all living things. What can we do? We can drive electric cars!

    Electric cars do not use gas. These cars do not make the air dirty. These cars have batteries that power their motors (马达). The batteries can be charged (充电) many times. They can be used again and again. This makes electric cars great.

    But electric cars have problems too. They are slower than gas cars. They are also very quiet. This means that some people can't hear them when they go by. They may not think a car is coming. So they have to be careful.

    People are finding ways to make electric cars better all the time. Maybe one day all cars will be electric. That would be much better for the world.

    America is a mobile society. Friendship between Americans can be close and real, yet disappears soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while, then no more, If the same two people meet again by chance, even years later, they pick up the friendship.

    This can be quite difficult for us Chinese to understand, because friendship between us flows more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.

    Americans are ready to receive us foreigners at their homes, share their holidays and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.

    Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don't show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may be generous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. Americans, however, express their welcome at home. But they truly cannot manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves to be treated hospitably.

    For Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!

There are 520 boys and 500 girls in our school. The school made a survey（调查）about our favorite sports. Here are the results.

After seeing the results, the P. E. teacher advises us to join different sports clubs. He also encourages（鼓励）us to try some new sports. It may bring us some surprises.