单项选择题

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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单项选择题
How could Dennis distinguish between a small ball and a large ball from a distance of 3 feet The large ball would produce ______.
A．a sharper sound
B．a softer sound
C．a higher-pitched sound
D．a louder sound
单项选择题
If someone holds a book 6 feet directly in front of Denis and then moves it only 1 foot directly in front of him, what change in sound does. Dennis hear
A．A lover-pitched sound.
B．A higher-pitched sound.
C．A sharper sound.
D．A softer sound.
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