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Listen to this 2 英语初级听力(MP3+字幕) 第3课(6)

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Task 2. Dictation. Sleep.
It's clear that everyone needs to sleep. Most people rarely think about how or why they sleep, however. We know that if we sleep well, we feel rested. If we don't sleep enough, we often feel tired and irritable.
It seems there are two purposes of sleep, physical rest and emotional or psychological rest. We need to rest our bodies and our minds. Both are important in order for us to be healthy.
Each night we alternative between two kinds of sleep: active sleep and passive sleep. The passive sleep gives us our body the rest that's needed and prepares us for active sleep, in which dreaming occurs.
Throughout the night, people alternate between passive and active sleep. The brain rests, then it becomes active, then dreaming occurs. The cycle is repeated, the brain rests, then it becomes active, then dreaming occurs. This cycle is repeated several times throughout the night.
During eight hours of sleep, people dream for a total of one and half hours on the average.

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emotional [i'məuʃənl]

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adj. 感情的,情绪的

 
alternative [ɔ:l'tə:nətiv]

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adj. 两者择一的; 供选择的; 非主流的

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irritable ['iritəbl]

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adj. 易怒的,急躁的 adj. 【医】过敏的,易感受

 
alternate [ɔ:l'tə:nit,'ɔ:ltə:neit]

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adj. 交替的,轮流的,间隔的
v. 交替,

 
psychological [.saikə'lɔdʒikəl]

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adj. 心理(学)的

 
passive ['pæsiv]

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adj. 被动的,消极的
n. 被动性

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