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1、SectionⅠUseofEnglishDirections:Readthefollowingtext.Choosethebestword(s)foreachnumberedblankandmarkA,B,CorDonANSWERSHEET1(10points)Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals,1thisislargelybecause,2animals,westandupright.Thismea
2、nsthatournosesare3toperceivingthosesmellswhichfloatthroughtheair,4themajorityofsmellswhichsticktosurfaces.Infact5,weareextremelysensitivetosmells,6wedonotgenerallyrealizeit.Ournosesarecapableof7humansmellsevenwhentheseare8tofarbelowonepartinonemillion.Strangely,somepeoplefindtha
3、ttheycansmellonetypeofflowerbutnotanother,9othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate10smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend11tothebrain.However,ithasbeenfoundthatevenpeopleinsensit
4、ivetoacertainsmell12cansuddenlybecomesensitivetoitwhen13toitoftenenough.Theexplanationforinsensitivitytosmellseemstobethatbrainfindsit14tokeepallsmellreceptorsworkingallthetimebutcan15newreceptorsifnecessary.Thismay16explainwhywearenotusuallysensitivetoourownsmellswesimplydonotn
5、eedtobe.Wearenot17oftheusualsmellofourownhousebutwe18newsmellswhenwevisitsomeoneelse's.Thebrainfindsitbesttokeepsmellreceptors19forunfamiliarandemergencysignals20thesmellofsmoke,whichmightindicatethedangeroffire.1.［A］although［B］as［C］but［D］while2.［A］above［B］unlike［C］excluding［D］b
6、esides3.［A］limited［B］committed［C］dedicated［D］confined4.［A］catching［B］ignoring［C］missing［D］tracking5.［A］anyway［B］though［C］instead［D］therefore6.［A］evenif［B］ifonly［C］onlyif［D］asif7.［A］distinguishing［B］discovering［C］determining［D］detecting8.［A］diluted［B］dissolved［C］determining［D］dif
7、fused9.［A］when［B］since［C］for［D］whereas10.［A］unusual［B］particular［C］unique［D］typical11.［A］signs［B］stimuli［C］messages［D］impulses12.［A］atfirst［B］atall［C］atlarge［D］attimes13.［A］subjected［B］left［C］drawn［D］exposed14.［A］ineffective［B］incompetent［C］inefficient［D］insufficient15.［A］introd
8、uce［B］summon［C］trigger［D］create16.［A］still［B］al
