单项选择题

A．connects
B．operates
C．drives
D．manufactures
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单项选择题
A．typicallyB．especiallyC．specificallyD．essentially
A．typically
B．especially
C．specifically
D．essentially
单项选择题
A．discoveredB．disclosedC．inventedD．revealed
A．discovered
B．disclosed
C．invented
D．revealed
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