单项选择题

In manufacturing, cheaper materials are constantly being _________ for the more expensive kind.

A．replaced
B．transcended
C．transplanted
D．substituted
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单项选择题
A rich man could appeal with the aid of counsel, while a poor man would be _________ of this opportunity.
A．derived
B．deprived
C．described
D．deserved
单项选择题
Radio reception wasn't very good because of a disturbance in the atmosphere; the announcer's voice sounded very _________.
A．disputed
B．disclosed
C．distorted
D．discarded
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