单项选择题

Security officials say that computer crime is easy to accomplish and hard to (detect).

A．explain
B．uncover
C．discover
D．ignore
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单项选择题
The sound of the drums was (distinct) even from a distance.
A．definite
B．edible
C．clear
D．sharp
单项选择题
At the conference, the speaker tried to (express) his feelings concerning the urgency of favorable decisions.
A．convey
B．affect
C．impose on
D．summon
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