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JohnGlenn,thefirstAmericanastronauttoorbittheearth,lear...
问题详情:JohnGlenn,thefirstAmericanastronauttoorbittheearth,learnedhowtoflywhileattendingcollegein1939.Duringthedayhestudiedchemistry,andinhissparetime,hetookflyinglessons.Shortlyafterthe1941attackonPe...