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
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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 from 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 soun
单项选择题
The word reputation in my reputation in town enhanced my reputation at work is used in a(n) ______ sense.
A．derogatory
B．ironical
C．appreciative
D．neutral
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