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.
【资料下载】大学英语四级(选词填空)专项训练
