单项选择题


A．from
B．by
C．in
D．through
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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
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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