阅读短文，按要求完成短文后的各项任务
In the past, man did not have to think about the protection of the environment. There were few people on the earth, and natural resources(资源) seemed to be unlimited(无限的) .
Today things are different, the world has become too crowded. We are using up our natural resources too quickly and at the same time we are polluting our environment with dangerous chemicals (化学制品). If we continue to do this, human life on the ①_______ will ②_______ survive.
Everyone realizes today that if too many fish are taken from rivers and the sea, there will soon be none left. Yet, with modern fishing methods(方法) , more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the earth. Yet we continue to use bigger and more powerful machines to cut down more and more trees.
We realize that if rivers are polluted with waste products from factories, fish will die. However, in most countries wastes are still put into rivers or the sea, and there are few laws to prevent this. Also, weknow that if the population of the world is becoming larger and larger, in a few years there will not be enough food. What can we do to solve these problems?
If we eat more vegetables and less meat, there will be more food available for everyone.
③Our natural resources will last longer if we learn to recycle(循环再用)them. The world population will not rise so quickly if people use modern methods of birth control.
Finally, if we educate people to think about the problems, we shall have a better and cleaner planet in the future. In a word, it is very important to protect our environment.
小题1:在①、②空白处分别填入一个适当的词使句意完整、上下文通顺。
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小题2:把③句译成中文。
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小题3:回答问题: How can we protect fish?
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小题4:在文中找出与There are more and more people in the world.意思相近的句子。
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小题5:在文中找出最能表达该短文主题的句子，并将它写在答题卡上。
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小题1:earth not
小题2:如果我们学会循环利用自然资源的话，那自然资源将会维持更长的时间。
小题3:1,Don’t take too many fish from rivers and the sea.
2,Stop polluting rivers and the sea with waste products from factories.
小题4:The population of the world is becoming larger and larger .
小题5:In a word ,It is important to protect our environment.
题目分析：这篇短文主要讲述了在过去，人们不必担心对环境的保护。因为那时地球上人口稀少，自然资源（资源）似乎是无限的（无限的）。今天不同了，世界已变得过于拥挤。我们正在利用我们的自然资源，在同一时间太快，我们与危险化学品污染我们的环境（化学制品）。如果我们继续这样做，人类将无法生存，总之，保护我们的环境是很重要的。
小题1:单词填空题。根据短文提示，If we continue to do this。如果我们还继续这样做，在地球上人类将不能生存。故填earth not。
小题2:英汉互译题。Our natural resources我们的自然资源，last longer持续时间更成，if引导的条件状语从句。根据上下文故填如果我们学会循环利用自然资源的话，那自然资源将会维持更长的时间。
小题3:回答问题。问我们怎样能保护鱼类？根据文中with modern fishing methods(方法) , more and more fish are caught.和We realize that if rivers are polluted with waste products from factories, fish will die.这些情况应该是禁止做的，故答案1,Don’t take too many fish from rivers and the sea. 2,Stop polluting rivers and the sea with waste products from factories.
小题4:同义句题，根据文中weknow that if the population of the world is becoming larger and larger, 可知答案为The population of the world is becoming larger and larger .
小题5:主旨题。通读全文可知本文主要讲保护环境，所以答案为In a word ,It is important to protect our environment.