单项选择题

The ______ of seawater into drinking water is a complicated problem.

A．conversion
B．conjecture
C．concession
D．contraction
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单项选择题
Groups of police were ______ all along the street where the Queen was to pass.
A．dispersed
B．dispatched
C．dismissed
D．diffused
单项选择题
One third of the Chinese in the U.S. live in California, ______ in San Francisco.
A．dominantly
B．perpetually
C．predominantly
D．practically
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