AsmanyasoneinfiveUSteenagershavesomedegreeofhearingloss,accordingtoresearchers.Theysaytheproblemisgrowing.Teenagersreallydon’tpayattentiontohowmuchnoisetheyareexposed(暴露)to,JosefShargorodskyofBrig

　　AsmanyasoneinfiveUSteenagershavesomedegreeofhearingloss,accordingtoresearchers.

　　Theysaytheproblemisgrowing.

　　Teenagersreallydon’tpayattentiontohowmuchnoisetheyareexposed(暴露)to,JosefShargorodskyofBrighamandWomen’sHospitalinBostontoldReuters.“Oftenpeoplewon’tnoticeit,butevenslighthearinglossmayaffectlanguagedevelopment,”saidShargorodsky,oneoftheresearchers.

　　Thestudycomparedsurveysfromtheearly1990sandthemid-2000s.Eachincludedafewthousandteenagers.Inthefirstsurvey,about15percentofteenagershadsomedegreeofhearingloss.Some15yearslater,thatnumberhadrisenbyathird,tonearly20percent.

　　“Thiscertainlyisbignews,”saidAlisonGrimes,aneardoctor.Hearinglossisverycommoninoldpeople,Grimessaid,butsheaddedthatitwasworryingtoseeithappenintheyoungeragegroup.

　　Inbabiesandyoungchildren,hearingproblemsareknowntoslowlanguagedevelopment.Thescienceislessclearforteenagers,butitiseasytoimaginehowbeinghardofhearingcouldaffectlearning,saidGrimes,.

　　Thereasonsfortherisearestillunclear.Whenresearchersaskedteenagersaboutnoiseexposure–onthejob,atschoolorfromactivities,forexample–theteenagersdidn’treportanychange.ButShargorodskysaidthatmightnotbetrue.“Weknewfrombeforethatitisdifficulttoaskthisagegroupaboutnoiseexposure–theyunderestimate(低估)it.”FewpeoplewouldcallitnoisewhentheylistentomusicontheirMP3player,forexample.“Thereisadifferencebetweenwhatwethinkisloudandwhatisharmfultotheear,”saidGrimes.

　　Althoughit’snotclearthattheMP3playerscauseteenagers’hearingloss,Grimessaiditwasstillagoodideatoturndownthesoundandtakeshortbreaksfromlistening.

　　小题1:Accordingtotheresearchers,inaUSclassof40students,about____studentshavesomedegreeofhearingloss.A．oneB．fiveC．sixD．eight小题2:Whichofthefollowingstatementsistrueaccordingtothearticle?A．Slighthearinglossdoesnotinfluencelearning.B．Onlyafewoldpeoplehavehearingproblems.C．Hearingproblemscanslowlanguag