根据下面资料，回答 BythetimeIfinishedhighschool,myinterestinanimalshadgrown,andIenrolledatauniversitytostudybiology.Ilearnedsoonenoughthatstudyinganimalsatthislevelwasnotintheanimals′best31.Irememberonemidtermexamin32eachstudentwashandedalarge,freshly-killedfrogandinstructedtodissect(解剖)andmarkasetofbodyparts.Ilookedatthe33froginfrontofmeandwassaddenedthatherlifewas34awayforsuchaslightreason. Ayearlater,inthesamelabwhereIdissectedtheflog,Iperformedasmallactofanimaloperation.Wewere35onfruitflies,anditwastimetorecordthedistributionofcharacteristicsintheirnextgeneration.Flieswerekeptinsmallplasticbottles.Countingthenumberofflieswithwhiteorredeyesrequiredfirstexposingthemtoether(乙醚)36theycouldnotmove.Theflieswerethenspreadontoapieceofwhitepaper37andcounted.Whenthedatacollectionwascomplete,theflieshadnofurtheruse,andourinstructionsweretoputthemintoasmallglassdishofoilatthecenterofeachdesk,whichwastobetheirfinalresting38. Oncemylittlepileofflieshadbeencounted,Ipushedthemofftheedgeofthepaper.Aswerecordedourdata,Ikeptoneeye39them.Withinminutesthepilewashumming(嗡嗡叫)astinylegsandwingsbeattheirwayoutoftheetherfog.Iwasextremelyexcitedastheytookflight.Thatwasmyfirststepinrefusingtoconductscientificresearchthattreatednonhumanlifeina(n)40way. 第(31)题选
A.duties B.interests C.rates D.hobbies正确答案B
