4、y.7.Inplaceswhereitdoesnotrainveryoften,the function ofcanalsistodrainwaterfromriversorlakesandcarryittofields.8.Thereisalsoevidenceofslower acquisition oflanguageandahigherfrequencyoflearningdifficultiesforthesephysicallydisabledstudents.9.Ifyoumustsitfacingthedesk,shiftyourch