【Imaginearoadcrossingwithoutthethree-waytrafficsignal.Carstrucksschoolbusesbicyclistsandstudentswalkingtoschoolwouldtrytorushthroughthecrossing61_______thesametime.Theirsafetywouldbeindanger.ThankstoanAf】|小学英语问答-字典翻译问答网

问题标题：

【Imaginearoadcrossingwithoutthethree-waytrafficsignal.Carstrucksschoolbusesbicyclistsandstudentswalkingtoschoolwouldtrytorushthroughthecrossing61_______thesametime.Theirsafetywouldbeindanger.ThankstoanAf】

问题描述：

Imaginearoadcrossingwithoutthethree-waytrafficsignal.Carstrucksschoolbusesbicyclistsandstudentswalkingtoschoolwouldtrytorushthroughthecrossing61_______thesametime.Theirsafetywouldbeindanger.

ThankstoanAfricanAmerican62________(invent)namedGarrettAugustusMorganwehavethree-positiontrafficsignalsthathelpmakecrossingsmuch63________(safe).Mr.MorganwasborninKentuckyin1877.Heonlyreceivedsixyears’education.Asateenhelefthisfamily’sfarminsearchofbetter64___________(opportunity).LivinginCincinnatiOhiohecontinuedhisstudiesinEnglishgrammar.ThenhemovedontoCleveland65________heworkedasarepairmanforaclothingfactory.Hehadakeeninterestinsolvingproblems66________(meet)ineverydaylife.Laterhepatentedseveralinventions.Thethree-waytrafficsignalwasjustoneof67___________.Onedayhefeltverysadwhenhesawatrafficaccident.Tohelpreducetrafficaccidentsandsavepeople’sliveshe68__________(immediate)begantoworkontheinvention.Finallyitwas69______greatsuccesswhichsavedlivesthenand70________(be)stillsavinglivestoday.

李石山回答：

　　EFGBA

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