单项选择题

They are trying to work out a ______ to the problem.

A．satisfaction
B．solution
C．concentration
D．attention
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单项选择题
Let us know your address and telephone number, ______
A．shall we
B．will we
C．will you
D．ought we
单项选择题
Why does the writer mention a thief in the first paragraph ______
A．To show that a hacker is more dangerous than a thief.
B．To tell people that thieves like to steal computers nowadays.
C．To demand that a computer network should be set up against thieves.
D．To look into the case where hackers and thieves are the same people.
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