单项选择题

A．lifeline
B．lifework
C．lifespan
D．lifeguard
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单项选择题
A．currentB．streamC．flowD．flight
A．current
B．stream
C．flow
D．flight
单项选择题
A．more efficient asB．so efficient thanC．so efficient asD．as efficient as
A．more efficient as
B．so efficient than
C．so efficient as
D．as efficient as
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