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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