单项选择题

They joined the army (willingly).

A．intentionally
B．consciously
C．voluntarily
D．reluctantly
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单项选择题
Eating too much fat can (lead to) heart disease and cause high blood pressure.
A．attribute to
B．attend to
C．contribute to
D．devote to
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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