题目内容：
AnewstudysaysmanyyoungpeopleintheUnitedStatestakesubstancesthatareclaimedtomakepeople（26）sportsbetter.ThestudysaysthataboutonemillionAmericansbetweentheagesof12and17haveusedthesesportssupplements.
Thosewho（27）whatsportssupplementstheyusedidentifiedcreatine(肌酸)asthemost（28）.Thebodyproducescreatine（29）.SomefamousAmeri-can（30）useproductswithcreatinetoincreasethe（31）oftheirmuscles.IntheUnitedStates,thesubstanceissold（32）incandyandotherfoods.
However,creatinehasalsobeenlinkedtohealthproblems.Onedoctorsaidthatthesubstancecauses（33）pain.Hesaiditalsohasbeenlinkedtomuscleinjuryandkid-neyproblems.
Atradegroupforsupplementmakerssaiditbelievesthatcreatineissafe,whenitistakenbysomeoneresponsible.Thetradegroupsaysthereisalargeamountofevidencethatshowscreatineishelpfulforhealthypeople.
Seventypercentoftheyoungpeoplequestionedinthestudycouldnotidentifyanyharmfuleffectsthatmight（34）usingsportssupplements.Yet96percentofthembe-lievedthatpeoplewhousethesupplementsfacethepossibilityofsomehealthdamage.
TheresearchersurgedAmericanparentsandteachersto（35）childrenabouttheissue.Theyalsourgedthegovernmenttotakeactiontolimitthemarketingandsalesofsupplementstoyoungpeople.
第(26)题__________
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