四年级作文怎么写？( 七 )

Pollution Most of us today (recognize that environmental pollution has been a greatly serious problem.lots of plants trees corps are destroyed by bad air.many fish die of pois
2 onous water.thousands of people die from eating poisoned fish or breathing in gas.therefore, environmental pollution should be responsible for these diseases that are disabling, or bringing death not only to human beings, but also to wild life.)From above, we can find that the reasons why (environment are polluted more and more seriously)are as follows.the primary reason, I think, is (the reason of harmful substances into environment.for example, to prevent insects, farmers make use of great amounts of insecticides, so as to have bumper harvests.however, they pollute air, water and land ).Second,(the gas coming from the car engines and factories also make environment polluted badly ).the third reason actually is (the result of a growing population in the world.everyday, so much litter and waste are poured out from houses, also pollute the environment ).The significance for (controlling pollution) noted that it\\'s high time that more effective measures should be taken.Therefore, (new laws should be paed to limit the amount of pollutants from factories.moreover, in the households, there is an obvious need to reduce litter and waste.let\\'s make our good efforts, and the world will be a safer place to live for us).
四、说明原因型模块
These days we often hear that (1).It is common that (2).Why does such circumstance occur in spite of social protects? For one thing, (3).For another, (4).What is more, since
(5),it is natural that (6).To solve the problem is not easy at all, but is worth trying.We should do something such as (7) to improve he present situation, and I do believe everything will be better in the future.
注释：
1、提出论题
2、说明现状
3、理由一
4、理由二
5、理由三
6、理由三引起的后果
7、解决方法
相应作文：
Pollution of environment These days we often hear that (our living conditions are getting more and more serious because of the destruction of our environment ).It is common t
3 hat (many trees and animals are near extinction, and the all-important food chain has been destroyed.).Why does such circumstance occur in spite of social protects? For one thing, (the population of the world is increasing so rapidly that the world has been so crowded.).For another,(the overuse of natural resources has influenced the balance of natural ecology ).What is more, since (the industrial revolution ),it is natural that (a great number of factories have been springing up like mushrooms.The smoke and harmful chemicals released from factories also pollute the environment).To solve the problem is not easy at all, but is worthing.We should do something such as (planting more trees, equipping cars with pollution-control devices and learning to recycling natural resources )to improve the present situation, and I do believe everything will be better in the future.