单项选择题
A.Men ought to make gestures of politeness towards women. B.Women ought to make gestures of politeness towards men. C.Women have achieved equality with men. D.Men are beginning to treat women as equal human beings.
A.explosive B.caused by compressed tar C.a pressure disturbance D.shock wave
A.The Sonic Boom B.Air and Its Effects C.Faster Than Sound D.Problems Facing Aviation Today