单项选择题
A．functions
B．places
C．cells
D．actions
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单项选择题
A．preventedB．derivedC．originatedD．protected
A．prevented
B．derived
C．originated
D．protected
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单项选择题
A．flightB．operationC．movementD．transportation
A．flight
B．operation
C．movement
D．transportation
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