单项选择题

How long does it take for 200 hectares of rainforest to be destroyed

A．About 3 minutes.
B．About 200 minutes.
C．About 3 days.
D．About 3 seconds.
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A) for C) on B) about D) at
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C．on
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单项选择题
A) task C) research B) experiment D) job
A．task
B．experiment
C．research
D．job
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