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  • 1. (2022高二下·金台期中) 阅读理解

    Scientists have long said getting a good night's sleep is important to your health. The U. S. National Institute of Health says lack of sleep may even increase the risk of cognitive(认知) decline and Alzheimer's disease. Now, an American team of scientists reports that too much sleep might be similarly linked to such conditions.

    Researchers at Washington University School of Medicine did the sleep study. The study examined 100 adults who had been under medical observation for cognitive ability, the ability to think, for an average of 4.5 years. The average age of the study subject was 75. Eighty-eight of the group had been identified as free of cognitive damage. Twelve subjects were judged very mildly damaged.

    During the study, they were asked to complete several tests for signs of cognitive decline. The tests are combined into a cognitive score-the higher the score, the better. They also wore electroencephalography (EEG) devices for four to six nights to measure their brain activity during sleep.

    Overall, cognitive scores declined for those who slept less than 4.5 hours or more than 6.5 hours per night -as measured by EEG(脑电图). But the scores stayed the same for those in the middle of the range.

    Dr. Brendan Lacey is the director of the Washington University Sleep Medicine Center and led the research. He said, "Our study suggests that there is 'a sweet spot' for total sleep time for best cognitive performance. Short and long sleep times are associated with worse cognitive performance, perhaps due to insufficient sleep or poor sleep quality," Lacey added.

    Greg Elder is a sleep researcher at Northumbria University in New Castle, Britain. He was surprised about the findings that sleeping longer than 6.5 hours was linked with cognitive decline. Elder wrote in The Conversation, "Each person's sleep needs are individual. If people feel rested, there is no need to change how they sleep." He also noted that it suggests that sleep quality may be the key, as opposed to simply total sleep time.

    1. (1) What does the text mainly talk about?
      A . The importance of a good night's sleep to health.    B . A study on how to improve your cognitive ability C . The link between sleeping length and cognitive loss. D . The result of increasing sleep time for short sleepers
    2. (2) What do we know about the 100 participants of the study?
      A . Most of them don't have cognitive disorders.    B . Some of them are suffering from lack of sleep. C . All of the participants are more than 75 years old. D . A few of them are under medical observation.
    3. (3) What do the underlined words "a sweet spot" refer to in paragraph 5?
      A . Insufficient sleep. B . Poor-quality sleep. C . Too much sleep. D . A middle range sleep.
    4. (4) What is Greg Elder's attitude toward the findings of the study?
      A . Supportive. B . Doubtful. C . Indifferent. D . Objective.
    5. (5) What both Dr. Brendan Lacey and Greg Elder probably agree with?
      A . There is no need to change how people sleep despite cognitive decline. B . Lack of sleep may increase the risk of cognitive decline. C . Poor sleep quality is possibly linked with cognitive decline. D . Sleeping longer than 6.5 hours must be linked with cognitive decline.

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