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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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热门试题

单项选择题He appeared to be (absorbed in) the sports news on TV.

A．entertained in
B．listened to
C．concentrating upon
D．worried about

单项选择题In violin making, the (choice) of the wood is crucial.

A．selection
B．grain
C．resonance
D．shape