阅读理解Whatwillmanbelikeinthefuture－in5000oreven50000yearsfromnow?Wecanonlymakeguessesofcoursebutwecanbesurethathewillbedifferentfromwhatheistodayforma

　　阅读理解

　　Whatwillmanbelikeinthefuture－in5000oreven50000yearsfromnow?Wecanonlymakeguessesofcoursebutwecanbesurethathewillbedifferentfromwhatheistodayformanisslowlychangingallthetime．

　　Letustakeanobviousexample．Manevenfivehundredyearsagowasshorterthanheistoday．Nowonaveragemenareaboutthreeinchestaller．Fivehundredyearsisarelativelyshortperiodoftimesowemayassumethatmanwillcontinuetogrowtaller．Againinthemodemworldweuseourbrainsagreatdeal．Evensowestillmakeuseofonlyabout20％ofthebrain'scapacity．Astimegoesonhoweverweshallhavetouseourbrainsmoreandmoreandeventuallyweshallneedlargerones!Thisislikelytobringaboutaphysicalchangetoo：theheadinparticulartheforeheadwillgrowlarger．Nowadaysoureyesareinconstantuse．Infactweusethemsomuchthatveryoftentheybecomeweakerandwehavetowearglasses．Butoveraverylongperiodoftimeitislikelythatman'seyeswillgrowstronger．

　　Ontheotherhandwetendtomakelessuseofourarmsandlegs．Theseasaresultarelikelytogrowweaker．Atthesametimehoweverourfingerswillgrowmoresensitivebecausetheyareusedagreatdealinmodernlife．

　　Butwhatabouthair?Thiswillprobablydisappearfromthebodyaltogetherincourseoftimebecauseitdoesnotserveausefulpurposeanylonger．Inthefuturethenbothsexesarelikelytobebald(光秃的)．

　　Perhapsallthisgivestheimpressionthatfuturemanwillnotbeaveryattractivecreaturetolookat!Thismaywellbetrue．Allthesameinspiteofallthesechangesfuturemanwillstillhavealotincommonwithus．Hewillstillbeahumanbeingwiththoughtsandemotionssimilartoourown．

　　(1)

　　Thepassagemainlytellsusthat________．

　　[]A．

　　man'slifewillbedifferentinthefuture．

　　B．

　　futuremanwilllookquitedifferentfromus．