The human brain is divided into two sides, or hemispheres, called the right brain and the left brain. The two hemispheres work together, but each one specializes in certain ways of thinking.

    Each side has its own way of using information to help us think, understand, and process informa—tion.The left side of the brain controls language. It is more verbal and logical. It names things and puts them into groups. It uses rules and likes ideas to be clear, logical, and orderly. It is best at speech, reading, writing, and math. You use this side of the brain when you memorize spelling and grammar rules or when you do a math problem.

    The right side of the brain is more visual and creative. It specializes in using information it receives from the senses of sight, sound, smell, touch, and taste. This side of the brain likes to dream and experiment. It controls your appreciation of music, color, and art. You use this side when you draw a picture or listen to music.Although we all use both sides of our brains, one side is usually stronger or dominant. Some people are more “left—brained,” and others are more “right—brained”. Our dominant side influ—ences the kinds of jobs and hobbies we have. Politicians, artists, architects, and musicians depend on their right brains. Accountants, engineers, doctors, and lawyers usually rely on their left brains.

    The kangaroo is the world's largest living marsupial (有袋动物). It was first found on the island of southwestern Australia. The animal was given its name by a famous English tourist in the 18th century.

    The kangaroo may be 7 feet(2.1m) tall when standing upright and the male can weigh as heavy as 200 pounds(90kg). The female (雌性) is smaller and lighter than the male. The kangaroo's head is small, but its ears are large, and its fore feet are really small. The animal has strong back legs and long tail.

    The kangaroo usually covers from 5 to 10 feet(1.5 to 3m) with each jump. The female is usually faster than the male. The mother kangaroo has a pouch (育儿袋) in its abdomen (腹部). The baby kangaroo grows up in the mother's pouch slowly.

    The kangaroo lives on grass and other plants. It is always moving from one place to another, lying down to sleep on the ground during the night. It likes to enjoy the warm sunshine. When it's in danger, it can use its back legs and strong tail to protect itself.

    Answer the following questions with No more than 6 words.

    Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive (存活) if the rain is spread throughout the year, If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

    Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

    There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay beneath (在……之下) a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing--very, very slowly--as these forces of nature continue to work on the rock.

    Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted (适应) to life in the desert. During the heat of the day a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

Does your mood(情绪) change with the seasons?

Some people find that when the temperature goes down, so do their spirits. Those people sometimes feel sad for no reason. They eat more and put on weight. They have trouble sleeping. They can't think clearly. This is the winter blues(忧郁).

Here are some ways for you to beat the winter blues.

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Some experts say that the winter blues happen because we get less sunlight in winter than we do in other seasons. They say that the decrease(减少) in sunlight can make us feel sad. Getting more sunlight each day can help you feel better.

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Taking a walk or doing some exercise will make chemicals called endorphins(内啡汰)in your body. Endorphins are natural" feel good" chemicals.

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Avoid having too much sugar. If you prefer sweet food, like cookies or candy, it may be a sign that you need more protein(蛋白质), like meat, chicken or fish.

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Cut back if you have too many things to do. Make sure you have some quiet time to yourself. Get some rest. Don't be so busy that you get run-down.

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If you feel sad all the time and the feeling won't go away, you may have a bigger problem than the winter blues. Talk to a friend you trust, or get help from a doctor.

Have you ever wondered why we say maidongxi（卖东西）instead of mainanbei, shangcesuo（上厕所）instead of xiacesuo, and yijianxiangzuo（意见相左）instead of yijianxiangyou? Many Chinese words have directions in them, and there is lots of history and culture hidden behind. 

East or West

When going shopping, Chinese people say maidongxiinstead of mainanbei. A theory says that in the Tang Dynasty, there were two popular markets in Chang'an, the national capital at the time. One was called the East Market, and the other was called the West Market. When shopping, people usually went to the East Market first, and then went to the West Market. As time went by, people started to describe shopping as maidongxi. 

Up or down

We use shangcesuoto mean "go to the bathroom" and xiachufangto mean "go to the kitchen". Why? In ancient times, houses were laid out （布局）in a certain way. The gate of the house would face south, with the bathroom in the northeastern part of the house and the kitchen in the southeastern part. On maps, north is usually at the top while south is at the bottom. In Chinese, we talk about the north as shangand the south as xia. So people would say they're going up to the bathroom and down to the kitchen. 

Ancient Chinese not only used shangand xiato refer to （指代）directions but also social positions. For example, people used huangshangto refer to the emperor and dianxiato refer to princes who had a lower position than the emperor. 

Left or right

Most people today are right-handed. They feel uncomfortable if they try to use their left hand to write or use chopsticks. This was true in old times as well. So in ancient China, "left" was related to （与……有关联）being different, such as in yijianxiangzuo. If people don't accept common beliefs （信念）, we still say they are following ____. 

When shaking hands, it's important to know which hand to use. In most cultures, the right hand is generally used for a handshake. For example, in some countries, such as India and Nepal, the left hand is considered unclean. However, if you are in a culture where the left hand is used, you'd better do as the locals do. 

"Left" and "right" also have something to do with people's social position. For a long time in ancient China, "right" stood for higher position than "left". For example, the character "佑", developed from "右", means a person in a higher position would protect someone in a lower position. 

On weekends, the school is often quiet. But at Furong School in Sangzhi of Hunan Province, students take part in fun activities, such as playing soccer, {#blank#}1{#/blank#} and singing under the care of their teachers. 

Most students at the school are left- behind children. Their parents work far from home and they have{#blank#}2{#/blank#} to do on weekends. The school sets up some clubs so that the students can learn and {#blank#}3{#/blank#} during weekends. 

Huang Ying is in the Table Tennis Club. "I often watch table tennis {#blank#}4{#/blank#} on TV. I think playing table tennis is one of the best ways of staying {#blank#}5{#/blank#}. I play table tennis after school every day and I am really good at it now. " Huang says.