prep1-70,快考了，没弄明白，请NN赐教

70.   (35281-!-item-!-188;#058&007608)

According to a review of 61 studies of patients suffering from severely debilitating depression, a large majority of the patients reported that missing a night's sleep immediately lifted their depression.  Yet sleep-deprivation is not used to treat depression even though the conventional treatments, which use drugs and electric shocks, often have serious side effects.

Which of the following, if true, best explains the fact that sleep-deprivation is not used as a treatment for depression?

(A) For a small percentage of depressed patients, missing a night's sleep induces a temporary sense of euphoria.

(B) Keeping depressed patients awake is more difficult than keeping awake people who are not depressed.

(C) Prolonged loss of sleep can lead to temporary impairment of judgment comparable to that induced by consuming several ounces of alcohol.

(D) The dramatic shifts in mood connected with sleep and wakefulness have not been traced to particular changes in brain chemistry.

(E) Depression returns in full force as soon as the patient sleeps for even a few minute

答案E,有点没明白题，lifed depression是指没有睡觉会加重depression吗？还是说会减轻depression?似乎只有是减轻才好理解

失眠了突然就不郁闷了，但是如果再次入睡哪怕一点点时间都会使Depression returns in full force as soon as possible,当然这样指望靠失眠来治疗depression 的方法就靠不住罗。

OG上的题 原来讨论过

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=9192

我的理解：

 evidence: 这调查说大部分抑郁病人认为不睡觉可以治疗抑郁，

conclusion:虽然传统的电疗治疗抑郁有很多副作用，但是失眠治疗抑郁也不可行

问题： 让你解释或者找到更好的理由说明失眠不能用治疗抑郁

Which of the following, if true, best explains the fact that sleep-deprivation is not used as a treatment for depression?

 E的理解为：失眠了 就治疗抑郁，但是如果再次入睡哪怕一点点时间抑郁就会反弹更强了，所以这个办法不可行。