单项选择题

Control of these emissions by adequate gas-cleaning processing is essential. The underlined part means

A．abundant.
B．sufficient.
C．accurate.
D．satisfactory.
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They encourage doctors to ______ cheaper generic drugs instead of more expensive brand names.
A．recommend
B．advocate
C．specify
D．prescribe
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The ______ made slow but sure progress along the main street.
A．procedure
B．profession
C．process
D．procession
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