单项选择题


A．method
B．device
C．equipment
D．appliance
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单项选择题
A．reasonB．doubtC．wayD．problem
A．reason
B．doubt
C．way
D．problem
单项选择题
A．announcedB．eminentC．establishedD．indispensable
A．announced
B．eminent
C．established
D．indispensable
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