researchers at brigham found about one in five teenagers now阅读理解答案

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1、ResearchersatBrighamfoundaboutoneinfiveteenagersnow阅读理解答案　　ResearchersatBrighamfoundaboutoneinfiveteenagersnowhavesomedegreeofhearingdamage.Theresearchersdidnotsaywhyhearinglosshasrisen,butotherexpertshavestrongsuspicions.Onelikelyculprit,theysay,isMP3players.　　AnMP3playercanbedangeroust

2、ohearingwhenitsdecibellevelisturneduptoohigh.High-decibelsoundscandamagenerveendings,calledhaircells.Ifasoundisloudenough,thedamagecanbepermanent.Aloudsoundcanshakethemembrane(薄膜)onwhichthehaircellssit—“likeanearthquake”.Thatshakecanbreakorevenuproothaircells.Whenthathappens,thehaircells

3、arefinished.Humanearscannotregrowhaircells.Therefore,whenlisteningtoanMP3player,setavolumelimitandavoidexposuretoloudsounds.　　Ontheotherhand,theloudnessoftoday’smusicmaynotbetotallyunderyourcontrol.Musiccompanieshavebeenpurposelyturningupthevolume.It’satrendcalledthefightforloudness.　　Pl

4、ayaCDfromthe1990s.Thenplayanewlyreleasedtune.Don’ttouchthevolumecontrol.You’llprobablynoticethatthenewCDsoundslouderthantheoldone.Why?SoundengineerswhocreateCDsareusingdynamicrangecompression(压缩),atechnologythatmakesthequietpartsofasonglouderandtheloudpartsquieter.Theoveralleffectofcompr

5、essionisalouderrecording.　　Manymusiciansandsoundengineersaren’tpleased.Theysaythatcompressionisdrivingdownthequalityoftoday’smusic,makingitsoundflatandblaring.GrayHobish,asoundengineer,explainsthatmusicshouldbeacombinationofloudnessandsoftness.Butmusiccompanieswanttomakemusicloudersoitwi

6、llstandout.That’simportantinthecompetitionamongrecordingcompanies.　　Whataboutlisteners?Manyteenagerslistentomusiconthegoinnoisyplacesandthroughheadphones,allofwhichreducesoundquality.Soyounglistenersmaynotnoticethepoorerqualityofmodernrecordings.“Totheirears,”saysHobish,“themusicsoundsfi

7、ne.Andtheyarenotawareofthehiddenthreatofthemusictheyareenjoying.”　　44．Thephrase“likeanearthquake”inPara.2aimstoexplain_______.　　A．thatvolumecanstronglyaffectpartsoftheear　　B．howourbodyisunabletoregrowhaircells　　C．howmuchdamagetheearcanavoid　　D．thathaircellsareeasilydamage