安徽省高一下学期期末考试英语试卷(附带答案）.docx

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安徽省高一下学期期末考试英语试卷(附带答案）

一、阅读理解

AccordingtotheWorldHealthOrganization,aglobalgroupthatstudiespublichealth,1.1billionyoungadultsareatriskofdevelopinghearingloss.Smartphonesarelargelytoblame.Cansomeheadphonesreallydamageyourhearing?

Nervescarrymessagestoeachother,suchassoundsorsensations.Mosthearinglossistheresultofnervewreck.Scientistsusedecibelstomeasurevolume.Youcanlistento85decibelsprettymuchalldaywithoutcausinganydamage.Thatisaboutthenoiselevelofbusycitytraffic.Thingsquicklybecomedangerousonceyougetlouderthanthat.Thenoiselevelproducedatarockconcertorbyachainsawisabout115decibels.Atthislevel,damagecanhappeninlessthanaminute.Youmightnotimmediatelynoticelargehearingloss.Itwilladdupovertime.Somesmartphonescancrank(调高)musicto120decibels.Say:youlistento10songsinarowatthatvolume.Youmightnoticehearinglossbythetimeyoutakeoffyourheadphones.

Whatkindofheadphonesshouldpeopleuse?Allofthemhavedifferentbenefitsanddownsides.Earbudshaveabadreputationbecausetheysitinyourearcanal.Thisallowsthemtoreleasethesoundclosertoyourear.Thatmeanswhatyouhearisalmostthefullforceofthesound.Big,paddedover-earheadphonesdonotsitasclosetoyoureardrum.Theystilltrapinsound,though.Soundfromtheseheadphonesalsoreachesyoureardrumatnearlyfullforce.Thentherearesomespecialover-earheadphones,thekindwithfoam(泡沫)earphonecoverswhicharebetteratblockingnoise.Theydeliversoundaroundyourearinsteadofstraightintoit.Itmightnotsoundasgood,butit’shealthierforyourears.Solid-plasticin-earheadphonesarenotverygoodatblockingoutbackgroundnoise.Thismightmakeyouwanttopumpupthevolume.

Doctorsrecommendthattheirpatientsgetfittedforheadph