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1、英语任务型阅读及书面表达专练13一．任务型阅读认真阅读下面短文，并根据所读内容在文章后表格中的空格里填入最恰当的单词。Naturallyregulateyoursleep-wakecycleMelatonin（褪黑激素）isanaturallyoccurringhormone（激素）thathelpsregulateyoursleep-wakecycle．Melatoninproductioniscontrolledbylightexposure．Yourbrainshouldproducemoreinthe
2、evening,whenit'sdark,tomakeyousleepy,andlessduringthedaywhenit'slightandyouwanttostayawake．However,manyaspectsofmodernlifecandisturbyourbody'snaturalproductionofmelatoninandyoursleep-wakecycle．Spendinglongdaysinanofficeawayfromnaturallight,forexample,canimp
3、actyourdaytimewakefulnessandmakeyourbrainsleepy．Thenbrightlightsatnight—especiallyfromhoursspentinfrontoftheTVorcomputerscreen—canholdbackyourbody'sproductionofmelatoninandmakeithardertosleep,However,therearewaysforyoutonaturallyregulateyoursleep-wakecycle,
4、improveyourbody'sproductionofmelatonin,andkeepyourbrainonahealthyschedule．Increaselightexposureduringtheday☆Removeyoursunglassesinthemorningandletlightontoyourface．☆Spendmoretimeoutsideduringdaylight．Trytotakeyourworkbreaksoutsideinsunlight,exerciseoutside,
5、orwalkyourdogduringthedayinsteadofatnight．☆Letasmuchlightintoyourhome/workspaceaspossible．Keepcurtainsandblindsopenduringtheday,moveyourdeskclosertothewindow．☆Ifnecessary,usealighttreatmentbox．Alighttreatmentboxcancreatesunshineandcanbeespeciallyusefuldurin
6、gshortwinterdayswhenthere'slimiteddaylight．Improvemelatoninproductionatnight☆Turnoffyourtelevisionandcomputer．Manypeopleusethetelevisiontofallasleeporrelaxattheendoftheday．Notonlydoesthelightholdbackmelatoninproduction,buttelevisioncanactuallyexcitethemind,
7、ratherthanrelaxingit．Trylisteningtomusicoraudiobooks,orpracticingrelaxationexercises．IfyourfavoriteTVshowisonlateatnight,recorditforviewingearlierintheday．☆Don'treadfromabacklitdeviceatnight（suchasaniPad）．Ifyouuseaportableelectronicdevicetoread,useaneReader
8、thatisnotbacklit,i．e．onethatrequiresanadditionallightsourcesuchasabedsidelamp.☆Changeyourlightbulbs．Avoidbrightlightsbeforebed,uselow-wattagebulbsinstead．☆Whenit'stimetosleep,makesuretheroomisdark．Thed
