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Ordinary mountain sickness, a common condition among mountain climbers, and one from which most people can recover, is caused by the characteristic shortage of oxygen in the atmosphere at high altitudes. Cerebral edema, a rarer disruption of blood circulation in the brain that quickly becomes life-threatening if not correctly treated from its onset, can also be caused by a shortage of oxygen. Since the symptoms of cerebral edema resemble those of ordinary mountain sickness, cerebral edema is especially dangerous at high altitudes. Which one of the following is an assumption on which the argument depends? (A) The treatment for ordinary mountain sickness differs from the treatment for cerebral edema. (B) Cerebral edema can cause those who suffer from it to slip into a coma within a few hours. (C) Unlike cerebral edema, ordinary mountain sickness involves no disruption of blood circulation in the brain. (D) Shortage of oxygen at extremely high altitude is likely to affect thinking processes and cause errors of judgment.(E) Most people who suffer from ordinary mountain sickness recover without any special treatment. 答案是E,可是A为什么不对呢?(我的理由是:因为两种症候cerebral和ordinary mountain sickness很像,所以cerebral edema很可能用ordinary mountain sickness来治,从而耽误了治疗时间,所以cerebral edema 很危险。) |
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