2020年职称英语考试综合类完形填空基础训练(四)

2020年职称英语考试综合类完形填空基础训练4)Everylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclocktells_1_whentoformflowersandwhentheflowersshouldopen.Ittells_2_whentoleavetheprotectivecocoonandflyaway,andittellsanimalsandhumanbeingswhentoeat,sleepandwake.Eventsoutsidetheplantandanimal_3_theactionsofsomebiologicalclocks.Scientistsrecentlyfound,forexample,thatatinyanimalchangesthecolorofitsfur_4_thenumberofhoursofdaylight.Intheshort_5_ofwinter,itsfurbecomeswhite.Thefurbecomesgraybrownincolorinthelongerhoursofdaylightinsummer.Innersignalscontrolotherbiologicalclocks.Germanscientistsfoundthatsomekindofinternalclockseemstoorderbirdstobegintheirlongmigration_6_twiceeachyear.Birds_7_fromflyingbecomerestlesswhenitistimeforthetrip,_8_theybecomecalmagainwhenthetimeoftheflighthasended.Scientistssaytheyarebeginningtolearnwhich_9_ofthebraincontainbiologicalclocks.AnAmericanresearcher,MartinMoorhead,saidasmallgroupofcellsnearthefrontofthebrain_10_tocontrolthetimingofsomeofouractions.These_11_tellapersonwhento_12_,whentosleepandwhentoseekfood.Scientistssaythereprobablyareotherbiologicalclockcellsthatcontrolotherbodyactivities.Dr.Moorheadisstudying_13_ourbiologicalclocksaffectthewaywedoourwork.Forexample,mostofushavegreatdifficultyifwemustoftenchangetodifferentworkhours._14_cantakemanydaysforahumanbodytoacceptthemajorchangeinworkhours.Dr.Moorheadsaidindustrialofficialsshouldhaveabetterunderstandingofbiologicalclocksandhowtheyaffectworkers.Hesaid15_understandingcouldcutsicknessandaccidentsatworkandwouldhelpincreaseafactorysproduction.1. A)scientistsB)humansC)plantsD)animals2. A)insectsB)birdsC)fishD)snakes3. A)effectB)affectC)effectedD)affected4.the reason that C since5 .A) months B ) days C )6 .A) flight B ) fly c )7 .A) prevented from B ) intruded onA ) because B ) for )because of D )minutes D ) weeks movement D ) transportation ordered by C ) helped by D )8. A)andB)butC)thereforeD)however9. A)portionsB)partsC)sectionsDkinds10. A)tryB)triesC)seemD)seems11. A)thingsB)partsC)cellsD)actions12. A)awakenB)wakeC)awakeD)wake-up13. A)howB)whyC)whereD)what14. A)WeB)ItC)TheyD)You15. a)sob)withc)suchd)ifKEYS：CABCBAABBDCAABC