In1999,twelvepercentofpublicelementaryschoolsintheUnite...
问题详情：In1999,twelvepercentofpublicelementaryschoolsintheUnitedStatesrequiredstudentstowearuniforms.Justthreeyearslater,theamountwasalmostdoublethat.Astudyofsixbig-cityOhiopublicschoolsshowedstudents...