Unit18Speaking课件
日期：2010-11-06 11:06
InventionsUnit18SpeakingWhoarethey?CaiLunEdisonWattBiShengWrightbrothersWhatdotheyhaveincommon?TheyareinventorsWhatdoinventorshaveincommon?Whatisaninvention?AninventionissomethingproducedforthefirsttimethroughtheuseofimaginationorthinkingandexperimentsThestepsofinventingStepILearningAboutInventorsStepIIFindinganIdeaStepIIIResearchingandPlanningStepIVDevelopingandTestingStepVTheInventionConferenceHowmuchdoyouknowaboutinventionsandinventors?EachnumberrepresentsitsdifficultyofguessingThisinventionismadeofmetal50Thisinventionlookslikeabird40Itmakesitpossibleforpeopletoflytodifferentplacesintheworld30Itispoweredbyanengineandisflownbyapilot20GuesstheinventionbylisteningtothefollowinginformationPart160Part250Part340Part430This，
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