单项选择题

The Web browser is nice, but it also has its ______.

A．defects
B．faults
C．cracks
D．flaws
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单项选择题
He works as a ______ for this community, delivering letters and newspapers everyday.
A．messenger
B．passerby
C．preacher
D．burglar
单项选择题
A security officer at the factory, who ______ to give his name, said he had seen two men leave tile building.
A．descended
B．decreased
C．denounced
D．declined
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