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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单项选择题
A．activeB．ignoredC．inactiveD．useless
A．active
B．ignored
C．inactive
D．useless
单项选择题
A．even thoughB．thoughC．asD．as though
A．even though
B．though
C．as
D．as though
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