单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．On the table.
B．Behind his back.
C．Under his bottom.
D．On his lap.
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B
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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