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