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标题: 请教狒狒中的一题 [打印本页]

作者: juneyingmao    时间: 2009-7-9 14:26
标题: 请教狒狒中的一题

Questions 78-79

Despite improvements in treatment for asthma, the death rate from this disease has doubled during the past decade from its previous rate. Two possible explanations for this increase have been offered. First, the recording of deaths due to asthma has become more widespread and accurate in the past decade than it had been previously. Second, there has been an increase in urban pollution. However, since the rate of deaths due to asthma has increased dramatically even in cities with long-standing, comprehensive medical records and with little or no urban pollution, one must instead conclude that the cause of increased deaths is the use of bronchial inhalers by asthma sufferers to relieve their symptoms.

79. Which one of the following is an assumption on which the argument depends?

 

A.        Urban pollution has not doubled in the past decade.

B.        Doctors and patients generally ignore the role of allergies in asthma.

C.        Bronchial inhalers are unsafe, even when used according to the recommended instructions.

D.       The use of bronchial inhalers aggravates other diseases that frequently occur among asthma sufferers and that often lead to fatal outcomes even when the asthma itself does not.

E.    Increased urban pollution, improved recording of asthma deaths, and the used of asthma deaths, and the use of bronchial inhalers are the only possible explanations of the increased death rate due to asthma.

正确答案是E, 总的来讲,这题totally confused呀


作者: edmundshi    时间: 2009-7-9 16:10
逻辑链大概是这样的:
[“long-standing, comprehensive medical records” rules  out Explanation1.]+["with little or no urban pollution" rules out Explanation2.]=>"use of bronchial inhalers"(第三个原因)
为什么排除了两个原因了之后就能推出那又且仅有的第三个原因呢?
只有因为“导致这个结果的原因只有三种”即“urban pollution,improved recording of asthma deaths and the use of bronchial inhalers are the only possible explanationsa.”

作者: juneyingmao    时间: 2009-7-11 17:47
解释的非常清楚啊,太感谢了,明白了




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