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2021年考研英语真题(含答案解析)Directions:SectionIUseofEnglishReadthefollowingtext.Choosethebestword(s)foreachnumberedblankandmarkA,B,CorDonANSWERSHEET1.(10points)Researchonanimalintelligencealwaysmakesmewonderjusthowsmarthumansare.1thefruit-flyexperimentsdescribedinCarlZimmer'spieceintheScienceTimesonTuesday.Fruitflieswhoweretaughttobesmarterthantheaveragefruitfly大2家toliveshorterlives.Thissuggeststhat大3家bulbsburnlonger,thatthereisan大4家innotbeingtooterrificallybright.Intelligence,it大5家out,isahigh-pricedoption.Ittakesmoreupkeep,burnsmorefuelandisslow大6家thestartinglinebecauseitdependsonlearning―agradual大7家―insteadofinstinct.Plentyofotherspeciesareabletolearn,andoneofthethingsthey'veapparentlylearnediswhento大8家.Isthereanadaptivevalueto大9家intelligence?That'sthequestionbehindthisnewresearch.I