题目内容

7．______him not to do so，he wouldn't have made such a serious mistake．（　　）
A．If I persuadedB．Did I persuade
C．Had I persuadedD．If I should persuade

分析 如果我说服了他不要那么做的话，他就不会犯这么严重的错误了．

解答 答案：C
分析句意可知，本句是虚拟条件句；主句"he wouldn't have made such a serious mistake．他就不会犯这么严重的错误了"中的谓语部分使用了would（not）+have+done的形式，因此可知此处表达了与过去事实相反的情况，所以从句要用过去完成时；所以A．B．D都不正确；C．省略了连词if，所以要提前had，即使用倒装句．故选C

点评 本题考查了虚拟条件句的用法．首先要根据句意判断该句是否是虚拟条件句；然后根据主句或从句的谓语部分的表现形式来判断该句是与过去，现在还是将来事实相反的情况，从而选出正确的时态或表达形式；因此必须要熟练掌握虚拟条件句中关于时态对称的用法．

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Dr. J. Langdon Down first described this condition in 1887. He called these people idiot savants. An idiot savant is a person who has significant mental injury, such as in autism (自闭症) or retardation. At the same time, the person also exhibits some extraordinary skills, which are unusual for most people. The skills of the savant may vary from being exceptionally gifted in music or in mathematics, or having a photographic memory. One of the first descriptions of a human who could calculate quickly was written in 1789 by Dr. Benjamin Rush, an American doctor. His patient, Thomas Fuller, was brought to Virginia as a slave in 1724. It took Thomas only 90 seconds to work out that a man who has lived 70 years, 17 days, and 12 hours has lived 2,210,500,800 seconds. Despite this ability, he died in 1790 without ever learning to read or write.

Another idiot savant slave became famous as a pianist in the 1860s. Blind Tom had a vocabulary of only 100 words, but he played 5,000 musical pieces beautifully.

In the excellent movie Rain Man, made in 1988 and available on video cassette, Dustin Hoffman plays an idiot savant who amazes his brother played by Tom Cruise, with his ability to perform complex calculations very rapidly.

Today we more clearly recognize that the idiot savant is special because of brain impairment. Yet not all brain injury leads to savant skills. Some studies have shown that people who have purposeful interruption of the left side of the brain can develop idiot savant skills. However few people wish to participate in such experiments. There are many excellent reasons for not undergoing unnecessary experimentation on one’s brain. The term idiot savant is outdated and inappropriate. Virtually all savants have a high degree of intelligence and are thus not idiots.

1.The first paragraph is presented by ________.

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B. making a definition of “idiot savant”

C. giving examples to lead in the topic

D. making comparison to show our brains work

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A. The concept “idiot savant” was first out forward by Dr. Rush.

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B. the idiot savant may result from the purposeful interruption of the brain

C. experiments on one’s brain are harmful

D. idiot savants are actually very clever in certain fields

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