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31.Which of the following can be the main idea for the text?A.Some species in the sea are sensitive to the climate change.B.Marine habitats are being threatened from time to time.C.Ecological air conditioning system provides a kind of shade.D.Sea life can help other species survive the climate warming.DMiddle-school aged children who use the Internet and social media recreationally for morethan an hour each day during the school week have significantly lower grades,according to astudy from the Center for Gambling Studies at Rutgers University-New Brunswick."During the pandemic,technology has been essential to remote learning.Meanwhile,aconcern grows among parents that using technology may affect children's education bydeveloping undesirable study habits and reducing time on learning activities."said lead authorVivien Anthony (Wen Li),an assistant professor at the School of Social Work and researchassociate at the Rutgers Center for Gambling Studies."That's why we began this study."The researchers,including Professor Lia Nower of the Rutgers Center for Gambling Studiesand a researcher from Renmin University of China,analyzed the China Education PanelSurvey data,a national survey of educational needs and outcomes of children in China.Approximately 10,000 first-year middle school students were surveyed and followed.The results showed that children using the Internet and social media for entertainment fouror more hours daily were four times more likely to skip school than those who did not.Boysshowed lower school engagement levels than girls.However,children who used technology inmoderation (i.e.,less than one hour per day on weekends)experienced less boredom atschool,potentially due to the positive effects of participation in social media like peer bonding.Using technology for entertainment in moderation advanced children's cognitive development.高三英语试题第9页（共16页）