雅思写作:了解基本逻辑,避免常见错误

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    (一)了解基本逻辑,避免常见错误

      要了解基本逻辑错误一定不能错过一篇英文小品文Love Is A Fallacy(作者Max Shulman),这里仅列举出十种最常见的逻辑错误。

      1.草率前提 (Dicto Simpliciter)

      例如:Women are on average not as strong as men and less able to perform well politically. Therefore, women can''t pull their weight in government work.

      点评:虽然女性确实在政界担任较少工作,但这不意味着女性群体中所有的人都是这样。

      2.过度概化 (Hasty Generalization)

      例如:McDonald''s and KFC offer foods with little nutrition, and thus we cannot expect any fast food restaurant to provide us with nutritious foods.

      点评:两个个例不足以推出一个真理。

      3.因果颠倒 (Post Hoc)

      例如:Most young criminals watch violent movies before they commit their crimes; obviously, violent movies lead to juvenile delinquency.

      点评:甲事情发生在乙事情之前,这并不代表着先发生的甲事情就是后发生的乙事情的原因。

      4.矛盾前提 (Contradictory Premises)

      例如:If God can do everything, can he make a stone so heavy that he can''t carry?

      点评:前提条件中就有相互矛盾的地方,结论当然是错误的。

      5.感性论证 (Ad Misericordiam)

      例如:Think of all the poor, starving African children! How could rich countries be so cruel as not to help them?

      点评:抒情是不能当作论证的。

      6.错误类比 (False Analogy)

      例如:Young children are like flowers---flowers should stay away from terrible weather to grow, so children need to get rid of everything negative.

      点评:孩子和花朵的区别太大。成长的过程也太复杂。最好不要用这两者来类比。

      7.虚假假设 (Hypothesis Contrary to Fact)

      例如:If TV were not invented, today people would never have such wonderful entertainment brought by TV.

      点评:因为电视已经被发明了,对于过去的否定假设后所得出的结论都是逻辑上的错误结论。

      8.无关转移 (Red Herring)

      例如:Many people say we need to exploit the outer space, a point which I believe is wrong, because there are so many poor people on Earth who hardly make ends meet.

      点评:有一个问题没解决并不代表着另一个问题不值得解决。

      9.从众错误 (Bandwagon)

      例如:Everyone says it is justified to learn a second language so we must learn one.

      点评:人人都说,或者大多数都说,这并不意味着该观点正确。

      10.滑坡谬误 (Slippery slope)

      例如:If we don''t care about the environment, the world will die in 50 years.

      点评:从环境问题到世界灭亡,中间有无数环节未提供论证。

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