A.Pause button.
B.Record button.
C.Forward button.
D.Rewind button.
A.It’s about the tests of a new airliner before its flying.
B.It’s about how to protect a new airliner.
C.It’s about how,to train a new pilot.
D.It’s about what the airliner engineers should d0.
A.Because without air the plane Can’t fly.
B.Because the plane needs air for its fuel.
C.Because the passengers’lives depend on air.
D.Because the passengers have paid for it.
A.The plane would not go forward.
B.The plane would explode.
C.The plane would fall down.
D.The plane would fly slowly.