第十七單元 推展段落方法之九——因果法（Ⅰ）
17．1因果法
因果法（cause and effect）段落通常回答“why？”的問(wèn)題。大多數(shù)人認(rèn)為在自己或別人生活中發(fā)生的事情必然事出有因，因此總要知道為什么會(huì)發(fā)生這樣或那樣的事情。原因（cause）指的是導(dǎo)致結(jié)果的發(fā)生在過(guò)去的事情，結(jié)果（effect）指的是已發(fā)生的事情將會(huì)產(chǎn)生的后果。
17．2結(jié)果法
解釋一個(gè)原因（cause）的幾個(gè)結(jié)果（effects）的段落，可能以下面兩種順序之一出現(xiàn)：或者以原因開(kāi)頭，接著指出一個(gè)一個(gè)結(jié)果，如下面示范段落17－1所示；或首先擺出結(jié)果，然后指出原因。
示范段落17－1
Many people are worried about what television has done to the generation of American children who have grown up watching it．For one thing，recent studies tend to show that TV stifles creative imagination．Some teachers feel that television has taken away the child's ability to form mental pictures in his own mind，resulting in children who cannot understand a simple story without visualillustrations．Secondly，too much TV too early tends to cause children to withdraw from real life experiences．Thus，they grow up to be passive spectators who can only respond to action，but not initiate it．The third area for concern is the serious complaint frequently made by elementary school teachers that children exhibit a low tolerance for the frustrations of learning．Because they have been conditioned to see all problems resolved in 30 or 60 minutes on TV，they are quickly discouraged by any activity that promises less than instant gratification．But perhaps the most serious result is the impact of television violence on children，who have come to regard it as an everyday thing．Not only does this increase their tolerance of violent behavior in others，but most authorities now concede that under certain conditions，some children will imitate anti－ social acts that they witness on television．
17．3示范段落分析
主題句：Many people are worried about what television has done to the generation of American children who have grown up watching it．
因果模式（cause and effect pattern）：
原因（cause）：television
結(jié)果（effects）：1．TV stifles creative imagination．
2．TV causes children to withdraw from real life experiences．
3．Children exhibit a low tolerance for the frustrations of learning．
4．Children have come to regard violence as an everyday thing．
17．4關(guān)于如何寫(xiě)因果法段落的建議
1）段落一開(kāi)始就表明目的
在段落一開(kāi)始就陳述你所關(guān)心的原因或結(jié)果是什么。例如，在示范段落17－1，主題句就把目的限定為分析“the effects of television on American children”。
2）選擇主題要適中
選擇太大的主題會(huì)給你帶來(lái)麻煩。因此，記住要選擇你可以駕馭的主題。例如：“effects of television”作為主題會(huì)太大，難以下筆。然而把它限制為“effects on American children”就容易多了（第18單元繼續(xù)討論因果法）。
Exercise17－1
Directions：Write a paragraph，analyzing the effects of students cheating on exams．
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Exercise 17-2
Directions：Write a paragraph，analyzing the advantages of job interview．
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