Ordinary mountain sickness, a common condition among mountain climbers, and one from which most people can revover, is caused by the characeristic 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.
A. The treatment for ordinary mountain sickness differs from the treatment for Cerebral edema.
B. Cerebra 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 altitudes is likely to affect thinking process and cause errors of judgment.
E. Most people who suffer from ordinary mountain sickness recover without any special treatment.
答案是A， 不明白，请牛人指教，谢谢。
因为Cerebral edema如果不进行正确的治疗，会很快危及生命。
但是它的症状又和Ordinary mountain sickness的很像，所以人们很可能把cerebral edema误认为ordinary moutain sickness, 并且用治疗moutain sickness的简单方法对其进行治疗。
If A is true，那么把cerebral edema当成mountain sickness来治疗，就是用错误的治疗方法来治疗cerebral edema，会引起患者的生命危险。
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