单项选择题

A Laser beam can be turned into a ______ weapon.

A．deadly
B．dead
C．deadthly
D．deadening
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单项选择题
I need to see the foreign student adviser because my passport expires in a fortnight.
A．will be over
B．becomes invalid
C．will be reversed
D．becomes exhausted
单项选择题
I got a new battery for my recorder only last week, but it seems to have ______ already.
A．worn out
B．run down
C．knocked off
D．gone off
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