第十八单元 推展段落方法之九因果法(Ⅱ)
18.1原因法
有时,一个结果会源于几个原因。同样,段落可或以结果开头或以结果结束,作者可以从熟悉到不熟悉的原因逐一分析,或是从分析一个又一个读者不熟悉的原因开头,最后引出读者熟悉的结果。选用哪一种,决定于作者认为哪一种更有说服力。
示范段落18-1
Several changes have brought wild animals to the cities.Foremost is,that air and water quality in many cities have improved as a result of the 1970s pollution control efforts.Meanwhile,rural areas have been built up,leaving many animals on the edges of suburbs.In addition,urban wildlife refuges have been created.The Greater London Council last year spent $750,000 to buy land and build 10 permanent wildlife refuges in the city.As a result,many big birds are now living in the city.For peregrine falcons cities are actully safer than rural cliff dwellings.By 1970 the birds had died out east of the Mississippi because DDT had made their eggs too thin to support life.That year,scientist Tom Cade of Cornell University began raising the birds for release in cities,for cities afforded plentyof food.
18.2 示范段落分析
主题句:Several changes have brought wild animals to the cities.
因果模式(Cause-effect Pattern):
结果(Effect):wild animals back to the cities
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)
3)着重分析直接的、明显的原因
每个结果都有无数的原因,同样,每个行为都会导致无数的结果。因果段落应只着重分析直接的、明显的原因,忽略间接的原因。例如,一个学生成绩不好,直接原因是没有认真学习,间接原因也许是对学校不满。显然,我们应该着眼于直接的原因而摒弃间接的原因。
4)根据重要性或熟悉程度排列细节(见第19单元)
5)使用适当的排列符号(listing signals)(见第34单元)
Exercise 18-1
Directions:Read the following paragraph of cause and effect,adding suitable listing signals and linking expressions.
There are many reasons why languages change.____,
various languages that started from the same parent developed their own uniqueness after groups of speakers drifted away from one another to establish isolated,independent communities.________is the independence of and interaction with foreign cultures,often as a result of military conquest.________is rapidly expanding technologe and new systems of communication that bring all cultures and languages into close contact,with borrowing between languages a common phenomenon in the contemporary world.All languages change as the experiences of their speakers change.
Exercise 18-2
Directions:Write a paragraph analyzing the causes of students cheating on exams.
小升初英语语法专项练习:数词
小升初英语语法专项练习:形容词、副词
状语从句知识点总结:学习地点状语从句的几点注意
状语从句知识点总结:时间状语从句学习指导
状语从句知识点总结:状语从句在复合句中的位置
状语从句知识点总结:as引导时间状语从句的谓语特点
状语从句知识点总结:引导时间状语从句的五类引导词
状语从句知识点总结:让步状语从句学习指导
状语从句知识点总结:in that 作为连词的用法
状语从句知识点总结:unless与if…not表示否定条件时有何区别
状语从句知识点总结:引导比较状语从句的常用关联词
省略句知识点总结:省略在虚拟条件句型中的应用
状语从句知识点总结:学习原因状语从句的几点注意
状语从句知识点总结:条件状语从句学习指导
状语从句知识点总结:even though和even if的用法区别
状语从句知识点总结:suppose和supposing可用于引导条件从句吗
状语从句知识点总结: unless与if…not…同与异
状语从句知识点总结:用一般现在时表示将来
状语从句知识点总结:让步状语从句的用法及有关说明
状语从句知识点总结:providing和provided可用于引导条件从句吗
状语从句知识点总结:even可用于引导让步状语从句吗
小升初英语语法专项练习:形容词和副词
状语从句知识点总结:原因状语从句学习指导
省略句知识点总结:“连词+省略结构”用法归纳
状语从句知识点总结:状语从句的概念及时态特点
状语从句知识点总结:引导状语从句的“六类名词”
状语从句知识点总结:结果状语从句学习指导
状语从句知识点总结:状语从句常用引导词归纳
状语从句知识点总结:使用because的五注意
状语从句知识点总结:目的和结果状语从句注意事项
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