单项选择题

One is not guilty until he ______.

A．has proved
B．has been proved
C．is proved
D．will be proved
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单项选择题
Despite technical progress, some food production is still completely ______ on weather.
A．reliable
B．dependable
C．dependent
D．inseparable
单项选择题
Crisis would be the right term to describe the ______ in many animal species.
A．abolition
B．restriction
C．descent
D．decline
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