JohnGlenn,thefirstAmericanastronauttoorbittheearth,lear...
問題詳情:JohnGlenn,thefirstAmericanastronauttoorbittheearth,learnedhowtoflywhileattendingcollegein1939.Duringthedayhestudiedchemistry,andinhissparetime,hetookflyinglessons.Shortlyafterthe1941attackonPe...