Tham khảo tài liệu 'bài tập bổ trợ và nâng cao - unit 4', tài liệu phổ thông, ôn thi đh-cđ phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | BÀI TẬP BỔ TRỢ VÀ NÂNG CAO - UNIT 4 I. Fill in the blank one missing word Conserving the World s Natural Resources In the decade of the 1970s the United Nations organized several important meetings 1 . the human environment to study a very serious problem. We humans are destroying the 2 . around us. We are using up all of our natural resources. We must learn to conserve 3 . or life will very bad for our children and our grandchildren. There are several major parts to this problem 1. Population Most problems of the environment come from population 4 . . In 1990 there were billion in 1950 2 5 billion 4 4 billion. In the year 2000 there will be billion. More people need more water more 5 . more wood and more petroleum 2. Distribution Scientists say there is enough water in the world for everyone 6 . some countries have a lot of water and some have only a little. Some areas get all their rain during one season. The rest of the year is 7 . There are huge forests in the Amazon area of Brazil. In other parts of the world there is only 8 . 3. Petroleum We are using up the world s petroleum. We use 9 . in our cars and to heat our building in winter. Farmers use petrochemicals to make the soil rich. They use them to 10 . insects that eat plants. These chemicals go into rivers and lakes and kill the fish there. Thousands of people also go into the air and pollute it. Winds carry this 11 . air to other countries and other continents. 4. Poverty Poor farmers use the same land over and 12 . . The land needs a rest so it will be better next. However the farmers must have food this year. Poor people cut down 13 . for firewood. In some areas when the trees are gone the land 14 . desert. However people need wood to cook their food now. Poor people can t save the environment for the 15 . This is not a problem for one country or one area of the world. It is a problem for all humans. The people and the nations of the world must work together to 16 . the world s resources. II. .
