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 soun
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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
The writer says that a blind baby is doubtly handicapped in comparison to a sighted child because ______.
A．his world is completely dark
B．he can never make eye contact with other people
C．he has no visual stimulation from his surroundings
D．he can not perceive the world with his eyes
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