单项选择题

Agriculture was a step in human progress （） which subsepuently was not anything comparable until our own machine age.

A．in
B．for
C．to
D．from

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单项选择题
We can't afford to let the situation get worse. We have to take （） to put it right.

A．decisions
B．advantages
C．sides
D．steps
单项选择题
Speech is the （） ability possessed only by human beings.

A．unique
B．average
C．collective
D．single
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