单项选择题

A new system of quality control was __________ to overcome the defects in the firm's products.

A．invested
B．installed
C．introduced
D．instructed
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单项选择题
Without telephone it would be impossible to carry on the function of __________ every business operation in the whole country.
A．precisely
B．practically
C．preferably
D．presumably
单项选择题
The murderer was proved to be an apparently well-behaved __________ middle-aged man.
A．ignorant
B．innocent
C．offensive
D．irritable
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