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.
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小题1:B
小题2:D
小题3:A
小题4:C
小题5:B
小题6:B
小题7:C
小题8:D
小题9:A
小题10:D
小题11:B
小题12:A
小题13:D
小题14:C
小题15:C
小题16:B
小题17:A
小题18:D
小题19:A
小题20:C
题目分析：
小题1:B。beautiful“美丽的”， unlimited“无限的”；rare“稀罕的，稀少的”； valuable“有价值的”。根据前面的There were few people on the earth可知此处指在过去资源是无限的。
小题2:D。与过去形成对比，表示现在情况不同了。
小题3:A。根据第一段的There were few people on the earth可知过去地球上人很少，而现在人很多、很拥挤。
小题4:C。protect“保护”，save“节约，拯救”； pollute“污染”；fight“斗争，打架”。根据句中的with dangerous chemicals可知此处指人们正在用有害的化学物质污染环境。
小题5:B。句意：如果我们继续这样，地球上的人类就不能生存下去。
小题6:B。wonder“想知道”； realize“意识到”； consider“考虑，认为”； discover“发现”。根据第四段的We realize that if rivers are polluted with waste products from factories, we will die. 可知应选B。句意：现在每个人都意识到如果从海中捕捞太多的鱼，不久就没有鱼了。
小题7:C。modern fishing methods表示“现代的捕鱼方法”。
小题8:D。根据前面的We know that if too many trees are cut down可知此处应选forests（森林）。
小题9:A。根据Yet可知，虽然人们意识到过度砍伐树木的危害，但人们还是继续那样做。干扰项是C、D。若选C、D，keep与 go on后面要跟v. -ing形式。
小题10:D。根据Yet可知，虽然人们意识到过度砍伐树木的危害，但人们仍然用大型机械砍伐树木。
小题11:B。根据上下文可知此处表示转折，however经常位于句首、句中或句末，且用逗号与主句隔开。but也表示转折，但不用逗号与主句隔开。A、D两项表示“因此”。
小题12:A。句意：然而在很多国家，垃圾仍然被扔进河流或大海。
小题13:D。根据语境可知此处应指几乎没有法律来制止这样做。
小题14:C。production“生产”; pollution“污染”; population“人口”; pronunciation“读音”。根据句中的there will not be enough food以及下文的The world population will not rise so quickly可知此处应选C。
小题15:C。solve these problems表示“解决这些问题”，干扰项是A、B。若选A，A项应为work out。若选B，B项应为deal with。
小题16:B。句意：如果我们多吃蔬菜少吃肉，那么每个人就会有更多的食物可以吃。
小题17:A。feed more people表示“养活更多的人”。
小题18:D。句意：如果我们学会对资源循环利用，我们的自然资源就会更持久些。此处last是动词，表示“持续”。
小题19:A。birth control表示“计划生育”。
小题20:C。planet此处指“星球”，即我们的地球。
点评：本文的话题是考生非常熟悉的话题—环境保护。整个完形填空大题，设空科学合理，考生不难从中领会大意，从而下手会比较顺利，从选项中可以看出，本大题主要还是考查了词汇的辨析与运用，但更加注重综合语言能力的运用，需要根据故事情节，了解词汇用法的同时，结合语境，做出准确的判断