Ordinary mountain sickness, a commoncondition among mountain climbers, and one from which most people can recover,is caused by the characteristic shortage of oxygen in the atmosphere at highaltitudes. Cerebral edema, a rarer disruption of blood circulation in the brainthat quickly becomes life-threatening if not correctly treated from its onset,can also because by a shortage of oxygen. Since the symptoms of cerebral edemaresemble those of ordinary mountain sickness, cerebral edema is especiallydangerous at high altitudes.

　　Which one of the following is anassumption on which the argument depends?

　　(A) The treatment for ordinary mountainsickness differs from the treatment for cerebral edema.

　　(B) Cerebral edema can cause those whosuffer from it to slip into a coma within a few hours.

　　(C) Unlike cerebral edema, ordinarymountain sickness involves no disruption of blood circulation in the brain.

　　(D) Shortage of oxygen at extremely highaltitude is likely to affect thinking processes and cause errors of judgment.

　　(E) Most people who suffer from ordinarymountain sickness recover without any special treatment.

　　答案选A

　　这道题目先讲了ordinarymountain sickness怎么样的，然后又讲了cerebraledema是怎么样，它们两者有共同点就是symptoms of cerebral edema resemble those of ordinary mountainsicknes，所以如果不当心的话，就容易把cerebral edema 看成是ordinary mountain sickness那样的话is especially dangerous at high altitudes.

　　A. 选项，提出了一个假设，就是他们两者的医疗方法不同，因为如果相同的话，用治疗普通登山症的方法也可以治cerebral edema，就不会有危险了

　　B. 无关选项

　　C. 讲普通的登山症怎样，文中已经讲了，不是什么前提

　　D. 无关选项

　　E. 无关选项

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