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1、UNIT4SPACEEXPLORATIONSectionⅡ ReadingandThinking(1)阅读理解AHoweverexcitingspaceexplorationsounds,there’sanecessaryandimportantpointaboutitthatneedstobeconsidered:foodsupplies.Rightnow,astronautstypicallyrelyondryfoodinairtightbagsandcans,sincetherearestrictw
2、eightlimitsonitemstakenintospace.Foodsthatwetakeforgranted,suchasfreshfruitandvegetables,areoutofthequestionforspaceexplorers. Forthosewho’vemadeanefforttotrytogrowfoodduringspaceflights,they’vefacedmanydifficulties,includingtheabsenceofgravity,andalackof
3、soil,airandhumidity(湿度).However,growingfoodtoaddandminimise(最小化)thefoodthatmustbecarriedtospacewillbeincreasinglyimportantonlong-durationflightsintospace.Greateffortshavebeenmadetoexploretheconcept(idea)ofspacefarming.Recently,ateamledbyFedericoMaggiatthe
4、UniversityofSydneyinAustraliahaveworkedouthowplantscanabsorbnutrientsfromhumanurine(尿),aswasreportedbyNewScientistonMarch27.Afterover20yearsofexperiments,theresultssuggestedthathumanurinecouldsupplythreetofouroutofthesixnutrientsthatplantsneed.Theresearch
5、ersalsofoundoutthaturine-fertilisedplantsproducenoharmfulby-products,suchascarbondioxideorammonia.AccordingtoNewScientist,humanurineis95percentwater,withtheother5percentmadefromnutrientswhichareharmfultothehumanbodybutnottoplants.Theadvantageofthisurine-f
6、ueledlifesupportsystemisobvious:Byrecyclingliquidwasteandproducingfood,anefficientcyclewillbecreated.Andmostimportantly,saidNewScientist,thedurationofspaceflightswillbegreatlyextendedto“20yearsofflight”,meaningwemaybesoonsendingastronautsonflightstoMars,o
7、revenbeyond.1.Whatdoestheunderlinedpart“outofthequestion”inthefirstparagraphprobablymean?A.Impossible. B.Unnecessary.C.Unimportant.D.Uncertain.解析:词义猜测题。根据上文“Rightnow,astronautstypicallyrelyondryfoodinairtightbagsandcans,sincetherearestrictweightlimits
8、onitemstakenintospace.”可知,目前宇航员通常依赖于装在密封的袋子和罐子里的干燥食品,因为带进太空的物品有严格的重量限制。故可推测我们认为理所当然的食品,如新鲜水果和蔬菜对于太空探索者来说是“不可能的;难以实现的”。impossible不可能的;unnecessary不必要的;unimportant不重要的;uncertain不确定的。故选A。答案:A2.Whatcanwelearnfromtheresea
