完形填空（共20小题；每小题1.5分，满分30分） In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 1 . Today things are 2 , and the world has become too 3 . We’re using up our natural resources too quickly, and at the same time we are 4 our environment with dangerous chemicals. If we continue to do this, human life on the earth 5 survive. Everyone 6 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 7 , more and more fish are caught. We know that if too many trees are cut down, 8 will disappear and nothing will grow on the land. Yet, we 9 to use bigger and more powerful machines to 10 more and more trees. We know that if rivers are polluted with waste products from factories, we’ll die. 11 , in most countries wastes are 12 put into rivers or into the sea, and there are 13 laws to stop this. We know, too, that if the 14 of the world continues to rise at the present rate, in a few years there will not be enough 15 . What can we do to solve these problems? If we eat more vegetables and less 16 there will be more food available for every one. Land that is used to grow crops 17 five times more people than land where animals are kept. Our natural resources will 18 longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth 19 . Finally, if we educate people to think about the problems, we shall have a better and cleaner 20 in the future. 小题1: A．beautiful B．unlimited C．rare D．valuable 小题2: A．common B．the same C．changeable D．different 小题3: A．crowded B．small C．dirty D．busy 小题4: A．protecting B．saving C．polluting D．fighting 小题5: A．may not B．will not C．shall not D．could not 小题6: A．wonders B．realizes C．considers D．discovers 小题7: A．poles B．boats C．methods D．ideas 小题8: A．mountains B．seas C．trees D．forests 小题9: A．continue B．have C．ought D．go on 小题10: A．cut away B．cut off C．cut up D．cut down 小题11: A．Thus B．However C．Generally speaking D．Therefore 小题12: A．still B．even C．also D．certainly 小题13: A．too many B．a few C．some D．few 小题14: A．production B．pollution C．population D．revolution 小题15: A．houses B．vegetables C．food D．lives 小题16: A．fruit B．meat C．fish D．grain 小题17: A．feeds B．increases C．supplies D．helps 小题18: A．use B．stay C．keep D．last 小题19: A．control B．born C．place D．reward 小题20: A．star B．sea C．planet D．forest