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1、Unit7 TheSea能力提升题组训练(A)Ⅰ.阅读理解Everyoceanloverknowsthedangersofgettingcaughtinaripcurrent(离岸流).Experiencedswimmersknowitisrelativelyeasytoescapethenarrowchannelofthefastmovingwaterbyfloatingandallowingittodragyoufurtherintotheoceanorbyswimmingalongsidetheshore.However,inexperiencedbeac
2、hgoersoftenpanic,andtrytoswimtoland,placingthemselvesatriskofdrowningduetotiredness.AccordingtotheUSNationalOceanService,thecurrentskillabout100Americanseachyearandaccountfor80%ofalllifeguardrescues.Thesescarystatisticsmaysoonbeathingofthepast,thankstoCleverGirl,asmartbuoy(浮标)thatwar
3、nsswimmersofthepresenceofdeadlyripcurrents.ThesmartdeviceisthebrainchildofAustralianteenagerMaddisonKing,whocreatedCleverGirlasaprojectforherGrade12DesignandTechnologyclass.The18-year-old,whoworksasalifeguardduringhersparetime,cameupwiththebrilliantideaafterdiscoveringthatmostchildre
4、nwereunabletodetectripcurrents.Thebasketball-sizedplasticbuoy,whichcanbeattachedtoachainofsimilardevicesortheoceanfloor,isfittedwithasmallpropeller(螺旋桨).Whenthewatertravelsatspeedofover70centimeterspersecond,itspinsthepropellerfastenoughtopowerthelightatopthebuoy,warningswimmerstosta
5、yclearofthearea.Thoughitsoundssimpleenough,theyoungsterhadtoovercomenumerousdesignchallenges.Forinstance,shepickedaredlightsinceitiseasytoseeinthebrightsunlightandalsobecausethecolorservesasauniversalwarningsignfortouriststhatdonotspeakthelocallanguage.Thedevice’ssmoothsurfaceandhigh
6、handlesensureswimmersdonotgethurt,whiletheblack,white,andredstripedunderside,keepssharksandotheranimalsatbay.Futureversionsmightincludesomethinglikeawarningsiren,whichwouldprovidesoundwarningsofripcurrents.Besides,thepresentmodelcostabout$300tomake.“That’sbeyondmypurse.”shelaughs,“th
7、ecosthastobecutdown.”1.Whichofthefollowingistherightwaytoescapetheripcurrent? A.Waitingforrescues.B.Swimmingtotheshore.C.Movingfastinthewater.D.Floatingwiththewater.2.WhydidMaddisondecidetoinventCleverGirl?A.Shewantedtochallengehercreativity.B.Shewa
8、smotivatedby
