单项选择题

Despite technical progress, some food production is still completely ______ on weather.

A．reliable
B．dependable
C．dependent
D．inseparable
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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
单项选择题
Some parents are only concerned ______ their children's grades in studies.
A．of
B．at
C．about
D．for
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