【单选题】How could Dennis distinguish between a book and a pillow of the same size and at an equal distance in front of him A book would produce ______.
A．a higher-pitched sound
B．a louder sound
C．a sharper sound
D．a fuzzier sound
【单选题】How could Dennis distinguish between a book and a pillow of the same size and at an equal distance in front of him A book would produce ______.
A．a higher-pitched sound
B．a louder sound
C．a sharper sound
D．a fuzzier sound
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