单项选择题

A．enhanced
B．characterized
C．obscured
D．undertaken
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单项选择题
A．exploredB．acquiredC．terminatedD．commercialized
A．explored
B．acquired
C．terminated
D．commercialized
单项选择题
A．allocatedB．integratedC．diversifiedD．identified
A．allocated
B．integrated
C．diversified
D．identified
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