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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正确答案
试题解析
推断题。文章第二段首句提到了题干中的话,但该段随后讲述的就是声音的产生和频率等,并没有对该问题展开论述,因此C项正确。