历年考研英语完形填空真题.docxVIP

-CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN

-CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN

历年考研英语完形填空真题

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历年考研英语完形填空真题（2005）

Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals,1thisislargelybecause,2animals,westandupright.Thismeansthatournosesare3toperceivingthosesmellswhichfloatthroughtheair,4themajorityofsmellswhichsticktosurfaces.Infact

5,weareextremelysensitivetosmells,6wedonotgenerallyrealizeit.Ournosesarecapableof7humansmellsevenwhentheseare8tofarbelowonepartinonemillion.

Strangely,somepeoplefindthattheycansmellonetypeofflowerbutnotanother,9othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate10smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend11tothebrain.However,ithasbeenfoundthatevenpeopleinsensitivetoacertainsmell12cansuddenlybecomesensitivetoitwhen13toitoftenenough.

Theexplanationforinsensitivitytosmellseemstobethatbrainfindsit14tokeepallsmellreceptorsworkingallthetimebutcan15newreceptorsifnecessary.Thismay16explainwhywearenotusuallysensitivetoourownsmellswesimplydonotneedtobe.Wearenot17oftheusualsmellofourownhousebutwe18newsmellswhenwevisitsomeoneelses.Thebrainfindsitbesttokeepsmellreceptors19forunfamiliarandemergencysignals20thesmellofsmoke,whichmightindicatethedangeroffire.

1.[A]although[B]as[C]but[D]while

2.[A]above[B]unlike[C]excluding[D]besides

3.[A]limited[B]committed[C]dedicated[D]confined

4.[A]catching[B]ignoring[C]missing[D]tracking

5.[A]anyway[B]though[C]instead[D]therefore

6.[A]evenif[B]ifonly[C]onlyif[D]asif

7.[A]distinguishing[B]discovering[C]determining[D]detecting

8.[A]diluted[B]dissolved[C]determining[D]diffus