单项选择题

A．retaining
B．settling
C．maintaining
D．preserving
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单项选择题
A．particularlyB．remarkablyC．significantlyD．considerably
A．particularly
B．remarkably
C．significantly
D．considerably
单项选择题
A．currentB．downwardC．upwardD．disturbing
A．current
B．downward
C．upward
D．disturbing
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