【题目】A Diet Without Enough Protein Can Cause Depression
Depression is a condition so common. 【1】 The World Health Organization (WHO) calls it “a leading cause of disability.” Difficulty in falling asleep, loss of appetite, and loss of ability to concentrate are just a few of the other effects of depression. While life events such as the loss of a spouse or a job may create a happening of depression, many cases come from within, such as people’s diet.
As is reported, both before and during a happening of depression, those with the condition show a “poor appetite”. 【2】 On the other hand, depression may be closely related to protein. Many cases of depression happen to those who don’t eat properly, which then result in lack of protein taken into the body.
【3】 It all comes down to amino acids (氨基酸). Proteins are made up of amino acids. Both the human brain and nervous system use amino acids as a substance that creates a signal from one brain cell to another or one nerve cell to another. With them communication between the cells becomes possible.
【4】 But eight of them, the “essential” ones for communication between the brain cells, must be eaten in one’s diet. So a diet which is lacking in protein lessens the signal being sent from one brain cell to the next during a thought. The process can lead to twisted signals, which can not only lead to depression, but also aggression. 【5】
A. It happens with aggression.
B. It may lead to serious effects.
C. But how lack of protein occurs?
D. There are 20 different amino acids.
E. But what does protein have to do with depression?
F. The poor appetite itself can create a depressed mood.
G. This is why depression can often express itself as anger or aggression.
【答案】
【1】B
【2】F
【3】E
【4】D
【5】G
【解析】
这是一篇说明文。文章介绍的是饮食中缺乏足够的蛋白质会导致抑郁。
【1】根据下文提示:世界卫生组织(WHO)称其为“导致残疾的主要原因”。承接下文,B. It may lead to serious effects.(它可能会导致严重的后果。)切题。故选B。
【2】根据上文提示:据报道,在抑郁症发生之前和发生期间,这些人都表现出“食欲不振”。承接上文,F项 The poor appetite itself can create a depressed mood.(食欲不振本身就会使人情绪低落。)切题。故选F。
【3】下文提示:一切都归结于氨基酸。承接下文,E项 But what does protein have to do with depression?(但是蛋白质和抑郁症有什么关系呢?)切题。故选E。
【4】下文提示:但其中的八种,即脑细胞之间交流的“必需”物质,必须在日常饮食中食用。承接下文,D项There are 20 different amino acids.(有20种不同的氨基酸。)切题。下文中的but其转折作用,将上下文连在一起。故选D。
【5】上文提示“这个过程会导致扭曲的信号,这不仅会导致抑郁,还会导致攻击性。”承接上文,G项This is why depression can often express itself as anger or aggression.(这就是为什么抑郁症经常以愤怒或攻击性的形式表现出来。)切题。故选G。
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