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________.

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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