单项选择题
A．materials
B．metals
C．reserves
D．fuels
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单项选择题
A．effectiveB．reliableC．resourcefulD．efficient
A．effective
B．reliable
C．resourceful
D．efficient
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单项选择题
A．extensiveB．sophisticatedC．advancedD．significant
A．extensive
B．sophisticated
C．advanced
D．significant
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