单项选择题


A．related
B．relating
C．relating
D．relation
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单项选择题
A．criticallyB．approximatelyC．independentlyD．costly
A．critically
B．approximately
C．independently
D．costly
单项选择题
A．resourcesB．originsC．sourcesD．materials
A．resources
B．origins
C．sources
D．materials
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