单项选择题

Outside my office window there is a fire ______ on the right.

A．escape
B．ladder
C．steps
D．stairs
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单项选择题
The thieves ______ the waste paper all over the room while they were searching for the diamond ring.
A．spread
B．scratched
C．scattered
D．burned
单项选择题
A sheet of metal was shaken to ______ the sound of thunder.
A．stimulate
B．simulate
C．reproduce
D．duplicate
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