单项选择题

A．2001
B．2007
C．2011
D．2017
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单项选择题
A．It is an simple explosive.B．It is a military explosive.C．It is made in U.S. factories.D．It can be easily made indoors.
A．It is an simple explosive.
B．It is a military explosive.
C．It is made in U.S. factories.
D．It can be easily made indoors.
填空题
electric→electronic。
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