单项选择题

Subsonic flight does not produce a sonic boom, because it （）

A．does not disturb existing pressures
B．stays behind its disturbance
C．does not produce great enough changes in pressure
D．stays ahead of its disturbance

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单项选择题

A sonic boom is like every sound in that it is （）

A．explosive
B．caused by compressed tar
C．a pressure disturbance
D．shock wave

单项选择题

An appropriate title for this passage would be （）

A．The Sonic Boom
B．Air and Its Effects
C．Faster Than Sound
D．Problems Facing Aviation Today