考研英语阅读理解试题-5

考研英语阅读理解试 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 -5考研英语阅读理解试题-5Everylivingthinghasaninnerbiologicalclockthatcontrolsbehavior.Theclockworksallthetime;evenwhentherearenooutsidesignstomarkthepassingoftime.Thebiologicalclocktellsplantswhentoformflowersandwhentheflowersshouldopen.Ittellsinsectswhentoleavetheprotectivecocoonandflyaway.Andittellsanimalswhentoeat,sleepandwake.Itcontrolsbodytemperature,thereleaseofsomehormonesandevendreams.Thesenaturaldailyeventsarecircadianrhythms.Manhasknownaboutthemforthousandsofyears.Butthefirstscientificobservationofcircadianrhythmswasnotmadeuntil1729.InthatyearFrenchastronomer,Jean-Jacquesd"OrtousdeMairan,notedthatoneofhisplantsopeneditsleavesatthesametimeeverymorning,andclosedthematthesametimeeverynight.Theplantdidthisevenwhenhekeptitinadarkplaceallthetime.Laterscientistswonderedaboutcircadianrhythmsinhumans.Theylearnedthatman"sbiologicalclockactuallykeepstimewithadayofalittlelessthan25hoursinsteadofthe24hoursonaman-madeclock.AboutfouryearsagoanAmericandoctor,EliotWeitzman,establishedalaboratorytostudyhowourbiologicalclockworks.Thepeopleinhisexperimentsareshutofffromtheoutsideworld.Theyarefreetolistentoandlivebytheircircadianrhythms.Dr.Weitzmanhopeshisresearchwillleadtoeffectivetreatmentsforcommonsleepproblemsandsleepdisorderscausedbyageingandmentalillness.ThelaboratoryisintheMontefloreHospitalinNewYorkCity.Ithastwolivingareaswiththreesmallroomsineach.Thewindowsarecovered,sonosunlightormoonlightcomesin.Therearenoradiosortelevisionreceivers.Thereisacontrolroombetweenthelivingareas.Itcontainscomputers,one-waycamerasandotherelectronicdevicesforobservingthepersoninthelivingarea.Theinstrumentsmeasureheartbeat,bodytemperature,hormonesintheblood,othersubstancesintheurineandbrainwavesduringsleep.Adoctorormedicaltechnicianisondutyinthecontrolroom24hoursadayduringanexperiment.Theydonotworkthesametimeeachdayandarenotpermittedtowearwatches,sothepersonintheexperimenthasnoideawhattimeitis.Inthefirstfouryearsofresearch,DrWeitzmanandhisassistanthaveobserved16menbetweentheagesof21and80.Themenremainedinthelaboratoryforaslongassixmonths.Lastmonth,asciencereporterfor"TheNewYorkTimes"newspaper,DavaSobol,becamethefirstwomantotakepartintheexperiment.SheenteredthelaboratoryonJune13thandstayedfor25days.MissSobolwrotereportsabouttheexperimentduringthattime,whichwerepublishedinthenewspaper.1.Thebiologicalclockisbelievedtoplayanessentialrolein____.A.theregulationofbodytemperatureB.thesecretionofhormonesC.animalreproductionD.manyaspectsofplantandanimalphysiology2.Inhisobservation,theFrenchscientistnoticedthattheleavesofacertainplantmaintaineditsopening-and-closingcycles____.A.evenwhenitwaskeptinamurkyplacealldayB.evenifitwasplacedinthemoonlightC.evenwhenhewasobservingitfromadarkplaceD.evenduringthenighttime3.Thesentence"Theyarefreetolistentoandlivebytheircircadianrhythms."(InParagraph4)probablymeans____.A.Theycanleadtheirdailylivesaccordingtotheirbiologicalclocks,withoutreferringtoaman-madeclock.B.Theycanlistentothewonderfulrhythmsofthebiologicalclockandliveclosetothem.C.Theycanlivebyregulatingtheirowncircadianrhythms.D.Theyarefreefromtheannoyingrhythmsofeverydaylife.4.IntheexperimentconductedbyMr.Weitzman,thedoctorwhoisondutydoesnotworkthesametimeeachday____.A.insgroupstoobservetheabnormalbehaviorofthepeopleatdifferenttimesB.soasnottoberecognizedbythepeopleC.soastoavoidindicatingtothepeoplewhattimeitiswhenhestartsworkD.soastoleavethepeople"scircadianrhythmsindisorder5.MissSobolleftthelaboratory____.A.onJune13thB.onJune25thC.attheendofJuneD.onJuly7thKeystoPassage5DAACD