单项选择题

The book contained a large ______ of information.

A．deal
B．amount
C．number
D．sum
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单项选择题
There are ______ differences between theory and practice.
A．legible
B．laden
C．radical
D．medieval
单项选择题
More than one-third of the Chinese in the United States live in California, ______ in San Francisco.
A．previously
B．predominantly
C．practically
D．permanently
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