单项选择题

Find the same meaning as "erase" in the last sentence of the first paragraph.

A．Add.
B．Change.
C．Remove.
D．Store.
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The main reason why business or government has not taken tough measures to stop hacking is that ______.
A．they will cost too much money
B．communication may be interrupted
C．hacking has not caused much damage
D．tough measures are illegal
单项选择题
During the examination you are supposed to stay in your seats, to keep your eyes on your papers, ______ to anyone.
A．but could not talk
B．not talk
C．and not to speak
D．rather than
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