单项选择题

Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______of the quality of their products.

A．expense
B．expansion
C．exposure
D．expectation
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单项选择题
Knowing that the cruel criminal has done a lot of unlawful things, I feel sure that I have no ______but to report him to the local police.
A．time
B．chance
C．authority
D．alternative
单项选择题
The quality and number of a city's public roads offer an excellent means of gauging its prosperity.
A．protecting
B．creating
C．judging
D．tracing
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