职称英语等级考试完型填空模拟试题及参考答案职称英语等级考试完型填空模拟试题及参考答案完形填空（每题1分，共15分）阅读下面的短文。短文中有15个空白，在文章的后面，每一个空白都列出了四个备选答案。请根据文章的'内容选择合适的词或短语填在空白处。ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclocktells_________whentoformflowersandwhentheflowersshouldopen1.Ittells_________whentoleavetheprotectivecocoonandflyaway,andittellsanimalsandhumanbeingswhentoeat,sleepandwake.Eventsoutsidetheplantandanima__________theactionsofsomebiologicalclocks.Scientistsrecentlyfound,forexample,thatatinyanimalchangesthecolorofitsfur________thenumberofhoursofdaylight.Intheshort_________ofwinter,itsfurbecomeswhite.Thefurbecomesgraybrownincolorinthelongerhoursofdaylightinsummer.Innersignalscontrolotherbiologicalclocks.Germanscientistsfoundthatsomekindofinternalclockseemstoorderbirdstobegintheirlongmigration__________twiceeachyear.Birds__________flyingbecomerestlesswhenitistimeforthetrip,___________theybecomecalmagainwhenthetimeoftheflighthasended.Scientistssaytheyarebeginningtolearnwhich____________ofthebraincontainbiologicalclocks.AnAmericanresearcher,MartinMoorhead,saidasmallgroupofcellsnearthefrontofthebrain__________tocontrolthetimingofsomeofouractions.These_________tellapersonwhento___________,whentosleepandwhentoseekfood.Scientistssaythereprobablyareotherbiologicalclockcellsthatcontrolotherbodyactivities.Dr.Moorheadisstudying_________ourbiologicalclocksaffectthewaywedoourwork2.Forexample,mostofushavegreatdifficultyifwemustoftenchangetodifferentworkhours.__________cantake3manydaysforahumanbodytoacceptthemajorchangeinworkhours.Dr.Moorheadsaidindustrialofficialsshouldhaveabetterunderstandingofbiologicalclocksandhowtheyaffectworkers.Hesaid________understandingcouldcutsicknessandaccidentsatworkandwouldhelpincreaseafactory’sproduction.词汇：biologicaladj.生物（学）的migrationn.迁徙insectn.昆虫restlessadj.焦躁不安的cocoonn.防护卵袋，茧containv.含有furn.软毛celln.细胞注释：１、句中谓语动词tells的宾语有两部分组成。第一部分是whentoformflowers,是带疑问浮词的动词不定式，第二部分是whentheflowersshouldopen,是名词从句。从修辞上说，两者有些不平衡。２、…thewaywedo