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28.What was the main purpose of the study for old adults?A.To explore the risks of poor sleep.B.To encourage seniors to sleep earlier.C.To find a more ideal sleep temperature.D.To introduce a new wearable sleep monitor.29.What does the underlined word "turbulent"in Paragraph 2 probably mean?A.Nervous.B.Uneasy.C.Energetic.D.Comfortable.30.What did the study find?A.People sleep longer in a cooler environment.B.Poor sleep tends to affect females'health more.C.Seniors enjoy a sound sleep'in a room at most 25C.D.Sleep environment causes the drop in body temperature.31.What does the last paragraph mainly talk about?A.The limitations of the study.B.The methods used in the study.C.The valuable data of the study.D.The further study for researchers.DTheoretically some trees could live forever,according to a recent essay that reviews growingevidence on long-lived trees.Across the board,trees do not die so much as they are killed,write the authors of thereview essay.Their killers are outer factors rather than old age alone.That is,there is noevidence that harmful genetic mutations,(基因突变)occur over time or that trees lose theirability to continue to grow."Trees might live forever,but this does not happen,"says co-author Franco Biondi."Treekillers include environmental risks such as droughts,wildfires,terrible weather and humanbehaviors such as woodcutting and fires set to clear forests for hunting or grassland."Tree longevity (interests researchers in part because trees and other plants removecarbon from the atmosphere,and older trees are thought to store more carbon than younger ones.The rings of old trees can also serve as an invaluable record of climate history,with wider ringsindicating better years..David Stahle,a geographer and tree longevity researcher at the University of Arkansas,takes issue with the belief that trees can possibly live forever."The likelihood,all things beingequal,that trees can live forever seems unlikely to me,he says.口■英语·第6页（共10页）