【Whatwillmanbelikeinthefuture—in5000oreven50,000yearsfromnow?Wecanonlymakeguesses,ofcourse,butwecanbesurethathewillbedifferentfromwhatheistoday,formanisslowlychangingallthetime.Letustakeanobviou】

　　Whatwillmanbelikeinthefuture—in5000oreven50,000yearsfromnow?Wecanonlymakeguesses,ofcourse,butwecanbesurethathewillbedifferentfromwhatheistoday,formanisslowlychangingallthetime.

　　Letustakeanobviousexample.Man,evenfivehundredyearsago,wasshorterthanheistoday.Now,onaverage, menareaboutthreeinchestaller.Fivehundredyearsisarelativelyshortperiodoftime,sowemayassumethatmanwillcontinuetogrowtaller.Again,inthemodemworldweuseourbrainsagreatdeal.Evenso,westillmakeuseofonlyabout20%ofthebrain’scapacity(容量).Astimegoeson,however,weshallhavetouseourbrainsmoreandmore, andeventuallyweshallneedlargerones!Thisislikelytobringaboutaphysicalchangetoo:thehead,inparticulartheforehead,willgrowlarger.Nowadaysoureyesareinconstantuse.Infact,weusethemsomuchthatveryoftentheybecomeweakerandwehavetowearglasses.Butoveraverylongperiodoftimeitislikelythatman’seyeswillgrowstronger.

　　Ontheotherhand,wetendtomakelessuseofourarmsandlegs.These,asaresult,arelikelytogrowweaker.Atthesametime,however,ourfingerswillgrowmoresensitive（敏感的）becausetheyareusedagreatdealinmodernlife.

　　Butwhatabouthair?Thiswillprobablydisappearfromthebodyaltogetherincourseoftimebecauseitdoesnotserveausefulpurposeanylonger.Inthefuture,then,bothsexesarelikelytobebald.

　　Perhapsallthisgivestheimpressionthatfuturemanwillnotbeaveryattractivecreaturetolookat!Thismaywellbetrue.Allthesame,inspiteofallthesechanges,futuremanwillstillhavealotincommonwithus.Hewillstillbeahumanbeing,withthoughtsandemotionssimilartoourown.…

　　小题1:Thepassagemainlytellsusthat_______.A．man’slifewillbedifferentinthefuture.B．futuremanwilllookquitedifferentfromus.C．manisgrowingtalleranduglierastimepasses.D．human’sorgans’functionswillbecomeweak“小题2:Thechangeinman’ssizeofforeheadwillprobablybebecause___________.A．hemakesuseonIy20%ofthebrain’scapacity.B．hisbrainhasgrownlargeroverthepastcenturies.