单项选择题

A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
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单项选择题
We learn from the passage that the traditional view of slash-and-burn farming is that ________
A．it does no harm to the topsoil of the rainforest
B．it destroys rainforest soils
C．it helps improve rainforest soils
D．it diminishes the organic matter in rainforest soils
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