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
It was felt that he lacked the ______ to pursue a difficult task to the very end.
A．engagement
B．persuasion
C．commitment
D．preservation
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