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    For centuries people have hunted animals for food and pleasure.The invention of the gun made it so easy for humans to hunt that some animals were lolled by the thousands and even became extinct（绝种的）.This brings up some serious problems since breaks in the food chain upset the balance of nature.

    Large animals like tigers are being killed by the hundreds every year in India.The Royal Bengal tiger is the only type that exists in India and their number is greatly reduced every year because of poaching（偷猎）.The present number is about 2,000, all of which live in tiger reserves.Two hundred years ago the population was 23,000 or more.

    During the British rule of India,many of the so-called English gentlemen killed tigers for pleasure and to show their bravery.This seems stupid because killing an innocent（无辜的）creature with a gun is not a brave deed.

    Today the tiger skin is very popular.Rich people and fashion designers have no idea what they are doing. Competition between the rich to show off makes them blind to the serious effects.People persuade villagers to kill tigers to get money,and they do it because they are poor and need to feed their families.We must educate them,and the government should give them proper jobs to help solve this problem.

    The people to blame are those who buy animal products like ivories,furs,tiger bones for medicine and handbags made of animal skins.They must be put behind bars to stop this kind of trade.The earth is home for everyone on it. The trees,animals,birds,and fish of all kinds belong here as much as we do.Only we have the power to change their fate.

    Norman Borlaug, who is making a difference, is known around the world. He is often described as the man who has saved more lives than any other person in history. Norman Borlaug is considered the father of what has been called the Green Revolution. His ideas about agriculture increased crop production and ended hunger in many nations. Mr. Borlaug continues to be a leader among agricultural researchers.

    Norman Borlaug was born in 1914 on a farm in the American state of Iowa. In the middle of the 20th century, world population was expanding faster than food production. Experts said many people in developing countries would face starvation.

    Norman Borlaug was an agricultural researcher at the International Maize and Wheat Improvement Center in Mexico. He developed methods of growing wheat that increased the amount harvested by three times. He later repeated this success in India, Pakistan and Africa.

    His methods of farming saved millions of people who would have starved to death. Norman Borlaug was given the Nobel Peace Prize for his efforts in 1970.

    Norman Borlaug is still urging experts to think about the needs of people around the world. His latest concern is a disease in wheat called UG99. He says it has the power to destroy most of the wheat being grown around the world. He says reductions in agricultural programs have made it harder to take action against such threats.

    Mr. Borlaug's granddaughter Julie works at the center named after him at Texas A&M University in Dallas. She says his worry about food problems rises from the belief that hunger is unacceptable. She says Norman Borlaug still believes it is our responsibility as human beings to feed one another.

    While CCTV's educational show Animal World is well known, few big screen wildlife documentaries have been made by China's film industry.

    But Born in China, which came out on Aug 2, may be important for Chinese filmmakers who want to get into nature -themed films. The movie, directed by Chinese filmmaker Lu Chuan, was shot in theQinghai-Tibet Plateau and shows the animals' lives during different seasons.

    Born in China not only brings to audiences the lives of animals that are rarely seen in the wild—giant pandas, snow leopards, and golden monkeys, but also shows Chinese traditional culture.

    A symbol of China, the giant panda is both black and white. Its body is thought to show yin and yang, which ancient Chinese ideas were based on. The panda's gentle nature shows how yin and yang lead to peace. It can be seen in the film when a panda mother guides her baby to look for independence and explore the world.

    Unlike the shy pandas, monkeys always have strong personalities. The Monkey King in China's most famous novel Journey to the West has many conflicting traits(特点). It stands for not only impatience but also cleverness and energy. Born in China follows a 2-year-old golden monkey who leaves his family, but then returns and understands the meaning of responsibility.

    Just as the golden monkey, a mother snow leopard also faces difficulty in raising her babies in the wild. The leopards, known for their rapid attacks and quick footwork(脚步), have inspired a form of pictographic(象形拳) in Shaolin martial arts(武术).

    "Born in China is a means to show off Chinese traditional culture," director Lu told the reporter. "Chinese people have learned a lot from wild animals since ancient times. This is why I shot this nature -themed documentary."

    Palaces are known for their beauty and splendor, but they offer little protection against attacks. It is easy to defend a large building, but usually these buildings are not designed with the comfort of a king in mind. When it comes to structures that are both beautiful and defensive, the European castle is a big success.

    Castles were originally built in England by the Normans in 1066. They built towers and walls to secure the land they had taken. These castles provided the Normans with a quiet and safe place. They also served as bases of operation for attacks. In this way castles served both defensive and offensive roles. Besides, castles served as offices for governors. Those that were socially beneath the governor would come to report affairs and express their respect. They would address problems, handle business, feast, and enjoy festivities in castles. So castles served as social centers as well.

    The first castles were made from earth and wood, and they were likely to suffer from attacks by fire. Then wooden castles were gradually replaced by stone, which greatly increased the strength of these towers and walls. However, attackers could throw flaming objects into castles through the windows or burn the wooden doors. This led to moving the windows and entrances off of the ground floor and up to the first floor to make them more difficult to access.

    During the Middle Ages, attacks increased in regularity, so castle defenses were updated. Arrow-slits were added. They were small holes in the castle, which allowed defenders to fire without being hurt. Towers were built from which defenders could provide fire on both sides. The towers were connected to the castle by wooden bridges, so that if one tower fell, the rest of the castle was still easy to defend. A lot of rings of castle walls were constructed, so that even if attackers went past one wall, they would be caught on a killing ground between inner and outer walls. All of these increased the defense of castles.

    The end of castles can be attributed to gunpowder. During the 15th century, artillery, a kind of large guns, became powerful enough to break through stone walls. This greatly made the role of castles less effective. Though castles no longer serve their original purposes, remaining castles receive millions of visitors each year who wish to experience the situations of ancient times.

    Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van (住房汽车).

    A small car can hold four persons and a large car can hold six persons but it is very crowded. A van hold seven persons easily, so a family with three children could ask their grandparents to go on a holiday travel. They could all travel together.

    Mr. Hagen and his wife had a third child last year. This made them sell their second car and buy a van. In the van, the sixth and seventh seat are used to put other things, for a family of five must carry many suitcases when they travel. When they arrive at their grandparents' home, the suitcases are removed from the two seats which can then carry the grandparents.

    Americans call vans motor homes. A motor home is always used for holidays. When a family are traveling to the mountains or to the seaside, they can live in their motor home for a few days or weeks. All the members of a big family can enjoy a happier life when they are traveling together. That is why motor homes have become very popular. In America there are many parks for motor homes.