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
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单项选择题
Bower believed Dennis would be the ideal subject for his experiment because ______.
A．Dennis was blind at birth
B．Dennis was younger than anyone else he could find
C．Dennis's parents were quite worried about his future
D．Dennis always produced sharp clicking sounds with his tongue
单项选择题
The reason why the author says in the essay that the title of the movie This Land Is Mine is ironical was that the land is ______.
A．not really that of the native born black Americans
B．that of the Frenchmen; the land refers to France
C．mine; yet it was occupied by Germans
D．mine; the land is that of the Americans.
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