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Now listen to the following recording and answer questions 16 to 19.
16
A.They found the theory of flying.
B.They had few precedents to look to.
C.They knew how to control an airplane from the beginning.
D.They lacked research funding.
17
A.One.
B.Two.
C.Three.
D.Four.
18
A.Make a turn in the longitudinal axis.
B.Make a turn in the vertical axis.
C.Make a turn in the lateral axis.
D.Make a turn in any axes.
19
A.Turn the fins in the desired direction.
B.Turn the fins together in the same direction.
C.Turn the right fin up and left fin right.
D.Turn one side rising and one side dropping.
