[视听材料] 大学英语四级(选词填空)专项训练 四级

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大学英语四级(选词填空)专项训练
　　The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday.
　　While elderly people __47__ to sleep for fewer hours than they did when they were younger, this has a(n) __48__ effect on their brain's performance and they would benefit from getting more, according to research.
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