lEonArDo DA vinCi ______.
A．sAiD thAt mAn woulD in thE sky onE DAy
B．Built A kinD oF mAChinE whiCh nEvEr FlEw
C．DrEw mAny BEAutiFul piCturEs oF BirDs.
D．mADE DEsigns For Flying mAChinEs.