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In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be____36____ . Today things are___37_____, the world has become too___38____ . We are using up our natural resources too quickly, and at the same time we are___39____ our environment with dangerous chemicals. If we continue to do this, human life on the earth ___40____survive. Everyone___41_____ today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing__42_____ , more and more fish are caught. We know that if too many trees are cut down, ___43____will disappear and nothing will grow on the land. Yet, we ___44_____to use bigger and more powerful machines to __45____more and more trees. We realize that if rivers are polluted with waste products from factories, we will die.___46_____, in most countries wastes are ___47______put into rivers or into the sea, and there are _48_____laws to stop this. We know, too, that if the___49____ of the world continues to rise at the present rate, in a few years, there will not be enough___50_____. What can we do to solve these problems ? It we eat more vegetables and less___51____, there will be more food available for everyone. Land that is used to grow crops __52_____five times more people than land where animals are kept. Our natural resources will _53_____longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth__54_______ . Finally, if we educate people to think about the problems, we shall have a better and clearer ___55____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.consider D.discovers 小题7: A.poles B.boats C.methods D.ideas 小题8: A.mountains B.the sea C.trees D.forests 小题9: A.continue B.have C.ought D.will go on 小题10: A.grow B.plant C.save 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.plan D.reward 小题20: A.nature B.sea C.planet D.Forest