原因(Causes): 1.Air and water quality have improved.
2.Rural areas have been built up.
3.Urban wildlife refuges have been created.
18.3 因果因法
有时候,一个原因也许会引起一个结果,这个结果又成为另一个结果的原因,如示范段落18-2所示。
示范段落18-2
For some time now,medical scientists have noted an alarming increase in disease of the heart and circulation among people who smoke cigarettes.It has been found that the presence of nicotine in the blood stream causes blood vessels to contract,thus slowing circulation,which eventully leads to hardening of the arteries.As the arteries stiffen,less blood reaches the brain,and the end result of this slowdown is the cerebral hemorrhage,commonly referred to as astroke.In addition,nicotine in the bloodstream reduces the ability of the hemoglobin to release oxygen,resulting in shortness of breath.The lack of oxygen forces the heart to beat fasterthat is,the pulse rate increasesand in turn accelerates the risk of heart attack.
18.4.示范段落分析
因-果-因模式(Cause-Effect-Cause Pattern):
Smoking tobacconicotine in the blood streams
the blood vessels constract
18.5 关于写因果段落的建议(续)
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