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1、Wehaveknownforalongtimethatflowersofdifferentplantsopen阅读答案 Wehaveknownforalongtimethatflowersofdifferentplantsopenandcloseatdifferenttimesofday.Thisisso1thatthereseemstobenoneedtoaskthereasonforit.Yetnoone2understandswhyflowersopenandcloselikethisatparticulartimes.Theprocessisnotas3aswemigh
2、tthink,asrecentexperimentshaveshown.Inonestudy,flowerswerekeptinconstant4.Wemightexpectthattheflowers,withoutanyinformationaboutthetimeofday,didnotopenasthey5do.Asamatteroffact,they6toopenattheirusualtime.Thissuggeststhattheyhavesomemysteriouswayofknowingthe7.Theirsenseoftimedoesnot8informati
3、onfromtheoutsideworld;itis,sotospeak,insidethem,akindof“innerclock”. This9maynotseemtobeveryimportant.However,itwaslaterfoundthatnotjustplantsbutalso10,includingman,havethis“innerclock”which11theworkingoftheirbodiesandinfluencestheiractivities.Men,then,arealsoinfluencedbythismysterious12.Whe
4、therwewishitornot,itaffectssuchthingsinourlifeasourneedforsleep,ourneedforfood. Inthepast,thisdidnotreally13becausepeoplelivedinnaturalcondition.Inthe14world,thingsaredifferent;nowtherearespacemen,airplanepilotsand,inordinarylife,alotofpeoplewhohavetoworkatnight.Itwouldbevery15,then,toknowmo
5、reaboutthe“innerclock”.Suchthingsasflowersmighthelpusunderstandmoreaboutourselves. 1.A.familiarB.differentC.similarD.special 2.A.partlyB.personallyC.reallyD.willingly 3.A.complexB.simpleC.matureD.meaningful 4.A.quietnessB.darknessC.lonelinessD.sadness 5.A.finallyB.completelyC.physicallyD
6、.normally 6.A.refusedB.decidedC.continuedD.failed 7.A.timeB.secretC.processD.study 8.A.dealwithB.addtoC.giveawayD.dependon 9.A.discoveryB.activityC.inventionD.method 10.A.beastsB.animalsC.strangersD.humans 11.A.controlsB.studiesC.experimentsD.destroys 12.A.worldB.flowerC.powerD.experim
7、ent 13.A.happenB.existC.matterD.work 14.A.ancientB.modernC.wonderfulD.peaceful 15.A.hardB.expensiveC.convenientD.important
