单项选择题

A．by
B．to
C．in
D．at
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单项选择题
A．powerfulB．advancedC．developingD．industrialized
A．powerful
B．advanced
C．developing
D．industrialized
单项选择题
A．importedB．exploitedC．specifiedD．received
A．imported
B．exploited
C．specified
D．received
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