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
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
单项选择题
That year in New Jersey lives in my mind... ,as the author intended, means ______.
A．that was a year in which awful things happened to me
B．that was a year that I will never even forget
C．that was a year that only existed in my mind; but never happened to exist
D．that was a year when I lived in New Jersey
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