求解一道逻辑题

kobemvp

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.

选a   求解,谢谢~

hazardous

This is an old LSAT question.

Necessary assumption. Use negation.

If you negate A, you have: The treatment for ordinary mountain sickness is the same as the treatment for cerebral edema. If so, CE is not especially dangerous at high altitudes since it is curable even if it is mistaken with MS. The arguement falls apart. A is correct.

小宇宙2010

If you negate A,then you get "the treatments for ordinary mountain sickness and for cerebral edema are the same".As a result,if the symptom of cerebral edema appears and if we consider it of ordinary mountain sickness,we can still use the treatment of ordinary mountain sickness.Consequently,cerebral edema is NOT especially dangerous at high altitudes.

kobemvp

谢谢...!