单选题The pilot of the plane which flies faster than sound travels does not hear the thunderclaps because______.A
the sound of plane engine travels slower than the planeB
the frequency of the sound altersC
the passage does not mention itD
the pressure decrea
题目
单选题
The pilot of the plane which flies faster than sound travels does not hear the thunderclaps because______.
A
the sound of plane engine travels slower than the plane
B
the frequency of the sound alters
C
the passage does not mention it
D
the pressure decreased when the plane flies in the air
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