专题04 选词填空（上海专用）（解析版）.docx

专题04选词填空

（23-24高二上·上海·期中）Directions:Completethefollowingpassagebyusingthewordsinthebox.Eachwordcanonlybeusedonce.Notethatthereisonewordmorethanyouneed.

A．contact??B．serve???C．weakening??D．form??E.consciously??F.swell

G.leisurely??H.proportion??I.randomly??J.grasp??K.normal

Whydofingersgetwrinklyafteralongbathorswim?

Weknowskinwrinklesasyougetolderorwhenyoupinchitbetweentwofingers.Butit’sbeensomewhatofamysterywhyskingetswrinklyandevensometimeschangescolorafteryoutakea1bathorspendtoolongintheswimmingpool.

Oftenpeopleassumethatthesewrinklesformbecausetheskinabsorbswater,whichmakesit2upandbuckle.Tobehonest,Ididtooforalongtime.

Butresearchersbackinthe1930sdiscoveredthatinpeoplewithnervedamageintheirfingers,thepost-bathwrinklesdidn’t3.Wrinklyfingerscan’tjustbeduetowaterabsorptionthen,orthiswouldbeauniversalphenomenon,nomatterhowwellyournervesareoraren’tworking.

Toexplainwhatishappening,firstyouneedtoknowabitabouttheautonomicnervoussystem–theinvoluntarypartofhowyourbodyworks.Functionslikebreathing,blinking,yourheartpumpingoryourpupilsconstrictinginthesunallhappenwithoutyourneedingto4controlthem,thankstotheautonomicnervoussystem.

Italsoautomaticallycontrolstheexpansionandcontractionofyourbloodvessels.Thiscontractionofyourbloodvesselsisalsowhatcausestheskintowrinkleafteralengthyswim.

Whenyourhandsandfeetcomeinto5withwaterformorethanafewminutes,thesweatducts(汗腺管)inyourskinopen,allowingwatertoflowintotheskintissue.Thisaddedwaterdecreasesthe6ofsaltinsidetheskin.Nervefiberssendamessageaboutlowersaltlevelstoyourbrain,andtheautonomicnervoussystemrespondsbyconstrictingthebloodvessels.

Whentinybloodvesselsinsidetheskinc