仔细阅读下列短文, 根据题目, 选出最佳选项. Have you ever noticed an advertisement which says "Learn a foreign language in six weeks, or your money back! From the first day your pronunciation will be excellent. Just send ... " and so on Of course, it never happens quite like that. Anyone who learns a foreign language would think that it is not true. The only language that is easy to learn is the mother tongue. What is the mother tongue It is the first and main language that you learnt when you were a child. And think how much practice that a child gets! Before the Second World War, people usually learned a foreign language in order to read the literary(文学的) works of the country. Nowadays, speaking the foreign language is what most people want. Every year many millions of people start learning one. How do they do it Some people try at home, with books and tapes; some use radio or television programs; others go to evening classes. If they use the language only two or three times a week, learning it will take a long time, like language learning at school. A few people try to learn a language fast by studying for six or more hours a day. It is clearly easier to learn the language in the country where it is spoken. However, most people cannot afford this, and many language learners need the language in order to do their work better. For example, scientists and doctors mainly need to be able to read books and reports in the foreign language. Machines and good books will help, but they cannot do the student's work for him. Whether the language is learned quickly or slowly, it is hard work with a lot of training in reading, listening, speaking, and writing.

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　　More than 50,000,000 people live in the rainforests of the world and most of them do not hurt the forest they live in．They eat the fruits that grow on the forest trees, but they do not cut them down．They kill some animals to eat, but they do not destroy them．

　　When we cut down the rainforests, we destroy these forest people, too．In 1900, there were 1,000,000 forest people in the Amazon forest．In 1980, there were only 200,000．

　　The Yanomami live along the rivers of the rainforest in the north of Brazil．They have lived in the rainforest for about 10,000 years and they use more than 2,000 different plants for food and for medicine．But in 1988, someone found gold in their forest, and suddenly 45,000 people came to the forest and began looking for gold．They cut down the forest to make roads．They made more than a hundred airports．The Yanomami people lost land and food．Many died because new diseases (疾病)came to the forest with the strangers．

　　The Yanomami people tried to save their forest, because it was their home．But the people who wanted gold were stronger．

　　Many forest people try to save their forest．Chico Menders was famous in Brazil because he wanted to keep the forest for his people．“I want the Amazon forest to help all of us forest people, Brazil, and all the Earth,”he said．A few months later, in December 1988, people who wanted to cut down the forest killed Chico Menders．

　　In Borneo, people were cutting down the forest while the Penan people tried to save their rainforest．They made blockades(障碍)across the roads into the forest．In 1987, they closed fifteen roads for eight months．No one cut down any trees during that time．

　　In Panama, the Kuma people saved their forest．They made a forest park which tourists pay to visit．

　　The Gavioes people of Brazil use the forest, but they protect it as well．They find and seed the nuts which grow on the forest trees．

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