【阅读理解Areyoucarryingtoomuchonyourbackatschool?I'msurelotsofchildrenofyouragewillsay“Yes”.NotonlythestudentsinChinahavethisproblembutalsochildrenintheUnitedStateshaveheavyschoolba】

　　阅读理解

　　Areyoucarryingtoomuchonyourbackatschool?I'msurelotsofchildrenofyouragewillsay“Yes”.NotonlythestudentsinChinahavethisproblembutalsochildrenintheUnitedStateshaveheavyschoolbags.

　　Doctorsarestartingtoworrythatyoungerandyoungerstudentsarehavingbackandneckproblemsasaresultofschoolbagsbeingtooheavyforthem.

　　“It'shardformetogoupstairswithmybagbecauseit'ssoheavy”saidRickHammondan11-year-oldstudentintheUS.

　　Rickisamongstudentswhohavecommonschoolbagswithtwostraps(带子)tocarrythembutmanystudentschooserolling(有滚轮的)bags.

　　Butevenwithrollingbagsgettingupstairsandbusesisstillaproblemforchildren.Manyofthemhurttheirbacksandnecksbecauseoftheheavyschoolbags.Buthowmuchistoomuch?Doctorssaystudentsshouldcarrynomorethan10％to15％oftheirownbodyweight.

　　ScottBautchabackdoctorsaidchildrenunderGrade4shouldstaywith10％.Butitisalsoimportantthatolderchildrendon'tstaywithover15％becausetheirbodiesarestillgrowing.“Childrenarelosingtheirbalance(平衡)andfallingdownwiththeirschoolbags”hesaid.

　　Parentsandteachersarestartingtotellchildrentoonlytakehomethebookstheywillbereadingthatnight.Someteachersareusingpiecesofpaperorthinworkbooksforstudentstotakehome.Oneofthebestanswersisassomechildrensaidtohavenohomeworkatall!

　　(1)Fromthepassagewecanknowthat________.

　　[]

　　A.onlychildreninChinacarrytooheavyschoolbags

　　B.childreninothercountriesdon'tcarrytooheavybags

　　C.bothchildreninChinaandchildrenintheUScarrytooheavyschoolbags

　　D.onlychildrenintheUScarrytooheavyschoolbags

　　(2)Childrenfeelithardforthemtogoupstairsbecause________.

　　[]

　　A.theyaretooyoung

　　B.theirschoolbagsaretooheavy

　　C.theydon'tknowhowtogoupstairs

　　D.theirparentsdon'talwaysgoupstairswiththemtogether

　　(3)Ifachildcarryaheavyschoolbag________.

　　[]

　　A.hisbackandneckwillbehurt

　　B.hisheadandarmswillbehurt

　　C.hishandswillbehurt

　　D.hisfeetwillbehurt