{{B}}pAssAgE 3{{/B}} {{B}}quEstions 33 to 35 ArE BAsED on thE pAssAgE you hAvE just hEArD、{{/B}}

A．how to mAkE A powErFul roCkEt EnginE.
B．how to EnsurE thE sAFEty oF thE CrEw.
C．how to ChoosE quAliFiED CrEwmEn For thE trip.
D．how to EnABlE thE spACECrAFt BrEAk FrEE oF grAvity.