LSAT-3-1-15.help

wujie_ren · 发表于 2004-1-19 13:16:00

LSAT-3-I-15.
Baking for winter holidays is 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 improve the mood. In this respect, carbon hydrates 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.

The key is D, but what’s wrong with B and E?
(E) Raising the level of neurotransmitters in the brain effectively relieves depression.
The article says that Carbohydrates boost the brain’s levels of serotonin, a neurotransmitter that improve the mood, that means raising the level of N, improve the mood, and act the same way as some antidepressants.

(B) Lack of sunlight lowers the level of serotonin in the brain.
The article says that many people suffer from a specific type of seasonal depression caused by lack of sunlight, but carbohydrates boost the brain's levels of serotonin. Can that mean lack of sunlight lowers the level of serotonin.

Thanks.

kid · 发表于 2004-1-19 21:53:00

以下是引用wujie_ren在2004-1-19 13:16:00的发言：

The key is D, but what’s wrong with B and E?
(E) Raising the level of neurotransmitters in the brain effectively relieves depression.
The article says that Carbohydrates boost the brain’s levels of serotonin, a neurotransmitter that improve the mood, that means raising the level of N, improve the mood, and act the same way as some antidepressants.

(B) Lack of sunlight lowers the level of serotonin in the brain.
The article says that many people suffer from a specific type of seasonal depression caused by lack of sunlight, but carbohydrates boost the brain's levels of serotonin. Can that mean lack of sunlight lowers the level of serotonin.

in e,u considered"neurotransmitter=serotonin".However,there may be several kinds of neurotransmitters,and serotonin is just a kind of it.u don't know whether raising other kinds of neuro- can improve the mood.

in b,carbonhydrates not=sunlight.
even though carbonhydyrates=sunlight,we can't infer that lack of carbon- lower the serotonin from its function of boosting it.

the correct answer,D,we can infer from 'Carbohydrates, boost the brain’s levels of serotonin. In this respect, carbohydrates act on the brain in the same way as some antidepressants'
here the bridge is"carbo- = some antidepressants"

个人理解=)

wujie_ren · 发表于 2004-1-23 18:07:00

in e,u considered"neurotransmitter=serotonin".However,there may be several kinds of neurotransmitters,and serotonin is just a kind of it.u don't know whether raising other kinds of neuro- can improve the mood.

You mean the N mentioned in E may not equal to S?

idyll · 发表于 2005-4-15 12:41:00

我认为，关于B选项，文中只能推出提高serotonin的水平可以促进心情，而没有提到缺少阳光是如何造成沮丧的，可能是降低serotonin，也可能是通过其他途径，但无论是哪个都不影响原文的成立，所以B选项不正确。

LSAT-3-1-15.help

LSAT-3-1-15.help

LSAT-3-1-15.help

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