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Dowereallyspendthatmuchtimeonelectronicdevices备)，though?38Accordingtoarecentstudy,today'syoungAmericans(aged8-18)spendmorethanseven-and-a-halfhourseverydayonelectronicdevices,suchassmartphones,televi-sions,computers,andvideogames.Sowhat'sthebigdeal?Manyexpertshavenotedthatareli-anceuponelectroniccommunicationscanhaveanegativeeffectonsocialskillsandwritingskills.39Whiledigitalcommunicationsteachcertainskillsandhabits,face-to-faceconversationsteachotherskillsthatareimportantforouroverallwell-being.40Expertsurgepeopletostayawayfromscreensmoreoften.Setasidetimewithoutelectronicstoshareface-to-faceconversationswithfriendsandfamily.Keepingahealthybalance
5.下列关于动物行为类型的认识,错误的是()A.猫头鹰夜间活动——节律行为B.松鼠将采集的植物种子暂时储备起来——取食行为C.狮子和鬣狗相互撕咬——攻击行为D.草丛中的蝗虫是青绿色的——防御行为
