单项选择题

High production rates are often achieved at the ______ of quality of work.

A．expense
B．exposure
C．expansion
D．expectation
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单项选择题
Labor needs to match its ______ to spending with innovative ideas about service delivery, financing and management.
A．obligation
B．determination
C．resolution
D．commitment
单项选择题
In recent years, railroads have been combining with each other, merging into super-systems, causing ______ concerns about monopoly.
A．enhanced
B．curbed
C．disrupted
D．heightened
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