单项选择题

All day we could hear the bees ______ around the roses in our garden.

A．buzzing
B．bellowing
C．hissing
D．humming
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单项选择题
The ______ of seawater into drinking water is a complicated problem.
A．conversion
B．conjecture
C．concession
D．contraction
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
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