(D) 1970 was “ World Co ervation Year”. The UN wanted everyone to know that the world was in danger. They hoped that government would act quickly in order to co erve（保护） nature. Here is one example of the problem. At one time there were 1300 different plants, trees and flowers in Holland, but now only 860 remain. The others have been destroyed by modern man and his technology. We are changing the earth, the air and the water, and everything that grows and lives here. We can’t live without these things. If it continues like this, we shall destroy ourselves. What will ha en in the future? Perha it is more important to ask “ What must we do now?” The people who will be living in the world of tomorrow are the young of today. A lot of them know that co ervation is nece ary. Many are helping to save our world. They plant trees, build bridge acro rivers in forests, and so on. In a small town in the United Sates a large group of girls cleaned the banks of 11 kilometers of their river. Young people may hear about co ervation through a record called NO ONE’S GOING TO CHANGE OUR WORLD . It was made by the Beatles and other singers. The money from it will help to co erve wild animals. ( )16. The UN set up “ World Co ervation Year” because ___________. A. the world was in danger of war. B. the government had done something to protect the world. C. many things were destroyed by the technology. D. man and his technology destroyed the earth badly. ( )17. ________ kinds of plants have disa eared in the Holland in the past few years. A. 860 B. 440 C. 1 300 D. 2100 ( )18. “NO ONE’S GOING TO CHANGE OUR WORLD” is __________. A. a record B. a song C. a book D. a CD ( )19. It’s impo ible to save our world if we ________________. A. plant tree B. clean the banks of rivers C. picking ru ish D. listen to the record ( )20. The pa age mainly tells us__________. A. the people who will be living in the world of tomorrow are the young of today. B. what will ha en in the world in the future. C. co ervation of nature is nece ary D. everyone has known the importance of co ervation of Nature since 1970.