单项选择题


Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．The United States is huge.
B．Public transportation is not so good.
C．Americans like to be independent.
D．Americans like to move around.
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单项选择题
As some scientists have found, the vigorous exercise can make nerve cells to form interconnected webs that make the brain run （）.

A．steadily and more effectively
B．faster and more efficiently
C．more powerfully
D．more effectively
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