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The study,from the University of South Australia,the Murdoch Children's ResearchInstitute and the National Heart Foundation of Australia,assessed()1,179 children aged11and12."International guidelines suggest that children nced 9 to 11 hours of sleep,60 minutes ofphysical exercise and no more than two hours of relaxing screen time per day,yet only 7 percent of children can meet these goals,"said lead researcher Dr.Dot Dumuid,from theUniversity of South Australia.Queensland sleep expert Amanda Bude said sleep had an influence on children's physicaland mental(心理的)health.“Sleep health is not just about the physical characteristics(特of health but also the mental health and safety of our teens.Not getting enough of sleepcan have a bad influence on emotional development and even cause some mental healthproblems.It is so important that parents are able to help their children deal with the overscheduling of their busy lives and keep healthy as well.As a child enters the teenage yearstheir circadian clock()starts to set later and later and finding a balance is important,"she said.Sunshine Coast mum Cindy Buswell said keeping her four children active during the dayhelped them get a good night's sleep."Good sleep and exercise should go hand-in-hand not oneor the other,"she said.Sandringham mum Maxine Thomson also thought that sleep was important for her twodaughters."They have always had pretty good habits.At 8 p.m.we do reading and winddown."she said.28.How long do the international guidelines suggest for children's screen time?A.Only one hour.B.Just lwo hours.C.Not more than one hour.D.Less than two hours.29.How does the author develop the passage?A.By giving explanations.B.By following time order.C.By asking questions.D.By showing cause and effect.30.What docs the underlined phrasc "wind down"in the last paragraph mean?A.Relax slowly.B.Suddenly stop.C.Fall asleep.D.Get recovered.31.What's a suitable title for the passage?A.Do the right amount of sleep and never overdo itB.Sleep is just as good as exercise to keep kids healthyC.Sleeping too much can be bad for your mental healthD.Health and wellness are dependent on sleep and exercise高一英语第5页（共10页）(2022.11)