[讨论]Feifei-92

92. Baking for winter holidays is a tradition that may have a sound medical basis. In midwinter, when days are short, many people suffer from a specific type of seasonal depression caused by lack of sunlight. Carbohydrates, both sugars and starches, boost the brain’s levels of serotonin, a neurotransmitter that improves the mood. In this respect, carbohydrates act on the brain in the same way as some antidepressants. Thus, eating holiday cookies may provide an effective form of self-prescribed medication.

Which one of the following can be properly inferred from the passage?

A.       Seasonal depression is one of the most easily treated forms of depression.

B.        Lack of sunlight lowers the level of serotonin in the brain.

C.        People are more likely to be depressed in midwinter than at other times of the year.

D.       Some antidepressants act by changing the brain’s level of serotonin.

E.        Raising the level of neurotransmitters in the brain effectively relieves depression.

从这句话, boost the brain’levels of serotonin, a neurotransmitter that improves the mood, 得知, 只是serotonin有抗忧郁的作用, 而不是所有的neurotransmitter.

D is correct.

A，most easily treated forms和原文无关

B，没有提到的无关信息

C，无关比较

E，把原文的信息扩大范围了，原文说的是a neurotransmitter， E中变成了所有neurotransmitters。

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我选的B，我认为原文 depression caused by lack of sunlight，………………boost the brain’s levels of serotonin,所以，Lack of sunlight lowers the level of serotonin in the brain.

看过正确选项后，我的想法是：

D.       Some antidepressants act by changing the brain’s level of serotonin.

其正确的理由:

1）表现了原文中最直接的关系：antidepressants 与level of serotonin的关系

2）Some在这里使结论不会绝对化，符合properly inferred

不知道我这样的理解是否正确？同时，B选项有致命的错误么？

谢谢！

B是一个挺不错的迷惑选项。原文depression caused by lack of sunlight，………………boost the brain’s levels of serotonin。只是在说缺乏阳光会引起depression 而碳水化合物可以通过提高level of serotonin来改善心情。也就是在说碳水化合物治疗depression的原理，可是从这里并不能推理出缺乏阳光是通过什么来导致depression的。

谢谢！

我刚刚重新看这道题终于明白了。这是一个非常典型的隐蔽的“无关”选项，粗心的人（比如我）一不小心就会把lack of sunlight和levels of serotonin联系起来，其实，原文并没有说lack of sunlight lowers levels of serotonin，完全是我自己搭上关系的。很有可能出现的情况是：lack of sunlight导致AAA，AAA导致depression，而the brain’s levels of serotonin又是治疗depression的。

看来，还是那点：逻辑考的是“有关”，“无关”。什么是真正的“无关”，需要好好体会。

Thanks again!