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“Children look at screens for too long every day, and don’t exercise and sleep enough, and it’s affecting their cognitive(认知的) ability”, researchers have said 【小题1】 a new report. Researchers 【小题2】(study) how many children are following recommended screen time, exercise, and sleep guidelines. 【小题3】(publish) on Wednesday in The Lancet Child & Adolescent Health, the study showed that most U.S. children aren’t meeting the recommendations and it could be affecting their cognition.