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．expansion
B．exposure
C．expense
D．expectation
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单项选择题
A new technique______, the yields as a whole increased by 20 percent.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
单项选择题
The loss of his ______of hearing didn’t stop him from being a useful member of the society.
A．faculty
B．ability
C．capability
D．power
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