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________.
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A.onlychildreninChinacarrytooheavyschoolbags
B.childreninothercountriesdon'tcarrytooheavybags
C.bothchildreninChinaandchildrenintheUScarrytooheavyschoolbags
D.onlychildrenintheUScarrytooheavyschoolbags
(2)Childrenfeelithardforthemtogoupstairsbecause________.
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A.theyaretooyoung
B.theirschoolbagsaretooheavy
C.theydon'tknowhowtogoupstairs
D.theirparentsdon'talwaysgoupstairswiththemtogether
(3)Ifachildcarryaheavyschoolbag________.
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A.hisbackandneckwillbehurt
B.hisheadandarmswillbehurt
C.hishandswillbehurt
D.hisfeetwillbehurt