Imagineit's2035.Youhaveagoodjob，abigfamilyandyou'reabout40yearsold.Welcometoyourfuturelife.
Gettingreadyforwork，youpauseinfrontofthemirror.“Turnred，”yousay.Yourshirtchangesfromskybluetodeepred.Tinypreprogrammedelectronicsarerearrangedinyourshirttochangeitscolor.Lookingintothemirror，youfindithardtobelievethatyouare40.Youlookmuchyounger.Withamazingadvancesinmedicine，peopleinyourgenerationmaylivetobe150yearsold.You'renotevenmiddleaged.
Asyougointothekitchenandpreparetopouryourbreakfastcereal(谷类食物)intoabowl，youhear:“Toloseweight，youshouldn'teatthat，”fromyourshoes.Theyreadthetinyelectroniccodeonthecerealboxtofindoutthenutritiondetails.Youdecidetolistentoyourshoes.“Kitchen，whatcanIhaveforbreakfast？”Alistofpossiblefoodsappearonthecounteraskitchenchecksitsfoodsupplies.
“Readyforyourtriptospace.”Youaskyoursonanddaughter.Beforethe21stcenturyonlyspeciallytrainedastronautswentintospace—andveryfewofthem.Todayanyonecangotospacefordaytripsorlongervacation.Yourbestfriendevenworksinspace.Handingyourchildrenthreestrawberrieseach，youadd，“Thedoctorsaidyouneedtheseforspacetravel.”Thankstomedicaladvice，vaccinationshots(疫苗注射)areathingofthepast.Ordinaryfoodscontainspecificvaccines.Withtheberriesintheirmouths，thekidsheadforthefrontdoor.
It'stimeforyoutogotowork.Yourcarchecksyourfingerprintsandunlocksthedoors.“Myoffice.Autopilot.”Youcommand.Yourcardrivesitselfdowntheroadandmovessmoothlyintotrafficonthehighway.Yousitbackandunrollyourenewspaper.Thelatestnewsdownloadsandfillstheviewer.Lookingthroughthepages，youwatchthenewsasvideofilmsratherthanreadit.
20．Whatchangesthecolorofyourshirt?
A．Themirror.
B．Theshirtitself.
C．Thecounter.
D．Themedicine.
21．Howdotheshoesknowthatyoushouldn'teatbreakfastcereal?
A．Bypouringbreakfastcerealintoabowl.
B．Bylisteningtothedoctor'sadvice.
C．Bytestingthefoodsuppliesinthekitchen.
D．Bycheckingthenutritiondetailsofthefood.