单项选择题

As steel plants have become more ______, maintenance and adjustments of equipment have become a large share of the cost of running the plants.

A．allied
B．drafted
C．automated
D．duplicated
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单项选择题
Some American colleges are state-supported, others are privately _______, and still others are supported by religious organizations.
A．ensured
B．attributed
C．authorized
D．endowed
单项选择题
Before he started work, I asked the builder to give me an ________ of the cost of repairing the roof.
A．assessment
B．estimate
C．announcement
D．evaluation
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