单项选择题

His voice ______ his Welsh origins though he has been living in New York for 25 years.

A．preserves
B．muffles
C．monitors
D．betrays
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单项选择题
Profit sharing is a good ______ for employees.
A．treatment
B．experiment
C．incentive
D．reinforce
单项选择题
______ metal ran out of the furnace.
A．Molten
B．Graded
C．Welded
D．Consolidated
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