问题补充：
In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural 36seemed to be unlimited.
Today things are 37. The world has become too 38. We are 39our natural resources too quickly, and at the same time we are 40our environment with dangerous chemicals. If we 41to do this, human life on earth will not 42.
People realize today that if too many 43are taken from the sea, there will soon be none left. Yet, with modern fishing 44, more and more fish are caught.
We know that if too many trees are cut down, 45will disappear and nothing will 46on the land. Yet, we continue to use bigger and more powerful machines to 47more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. 48, in most countries waste products are still put into rivers or into the sea, and there are few laws to 49 this.
We also know that if the 50of the world continues to rise at the present rate, in a few years, there won be enough food. What can we do to solve the 51? If we eat more vegetables and less 52, there will be more food available for everyone. Land that is used to grow crops feeds 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 54so quickly if people use modern methods of birth control.
Finally, if we 55people to think about the problems we shall have a better and cleaner planet in the future.
【小题1】A．resourcesB．sourcesC．materialsD．matter【小题2】A．commonB．the sameC．changeableD．different【小题3】A．crowdedB．pollutedC．dirtyD．busy【小题4】A．producingB．using upC．reducingD．making【小题5】A．protectingB．savingC．pollutingD．fighting【小题6】A．tryB．continueC．stopD．have【小题7】A．liveB．lastC．continueD．survive【小题8】A．fishB．seagullsC．crocodilesD．frogs【小题9】A．polesB．boatsC．methodsD．ideas【小题10】A．mountainsB．the seaC．cropsD．forests【小题11】A．growB．plantC．saveD．cut down【小题12】A．plantB．cut downC．saveD．burn down【小题13】A．ThusB．HoweverC．Generally speakingD．Therefore【小题14】A．encourageB．neglectC．stopD．wake up【小题15】A．productionB．pollutionC．populationD．revolution【小题16】A．pollutionB．environmentC．questionsD．problems【小题17】A．fruitB．meatC．fishD．grain【小题18】A．useB．stayC．keepD．last【小题19】A．raiseB．riseC．runD．grow【小题20】A．forceB．helpC．educateD．showA
答案：
(答案→)A
解析：文章讨论了人类与环境保护的问题。
【小题1】名词辨析。A资源；B来源；C材料；D物质；根据句意可知是指自然资源。
【小题2】上下文串联。根据上下文可知是指现在的情况不一样了。
【小题3】上下文串联。第一段说以前的人少，现在情况不一样了，就是指现在的人多了。
【小题4】词义辨析。A生产；B用完；C减少；D生产。这里指我们正在用完我们的自然资源。
【小题5】动词搭配。A保护；B挽救；C污染；D战斗；根据上下文可知是指我们正在污染环境。
【小题6】上下文串联。这里是指如果我们继续这样，人类就将无法幸存。
【小题7】动词辨析。解析同上。
【小题8】上下文串联。根据下文的modern fishing可知这里谈论的是捕鱼。
【小题9】名词辨析。这里是指因为现代捕鱼技术，越来越多的鱼被捕了。
【小题10】上下文串联。上文提及砍树，那么应该是指森林将消失。
【小题11】上下文串联。上文提及森林消失，这里是指地球上没有东西可以继续生长。
【小题12】词义辨析。人类正在使用机器看倒越来越多的树木。
【小题13】词义辨析。A结果是；B然而；C一般说来；D因此；结合上下文可知这里表示转折。
【小题14】动词辨析。这里是指没有法律来阻止人类污染环境。
【小题15】上下文串联。这里是指如果污染的问题以现在的速度继续，。
【小题16】名词辨析。A生产；B环境；C问题。D难题。结合上下文可知是指解决这个难题。
【小题17】上下文串联。这里是指多吃蔬菜少吃肉。
【小题18】动词辨析。A使用；B保持，住在；C保持；D持续；这里是指我们的资源将会更持久。
【小题19】上下文串联。这里是指如果人类控制生育，那么污染就不会如此迅速增加。
【小题20】动词辨析。A强迫；B帮助；C教育；D展示；根据句意可知是指教育是解决环境问题的好方法。
