单项选择题

A．current
B．stream
C．flow
D．flight
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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
单项选择题
A．longB．extensiveC．exquisiteD．extreme
A．long
B．extensive
C．exquisite
D．extreme
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