单项选择题

The population of America continue to grow because of ______.

A．its growing birth rates
B．the migration of persons from other countries
C．its good health condition
D．its longer life expectancy
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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.
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 sound.
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