What is the main idea of the passage? What made recycling a major factor on the urban scene in 1970s?

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问题 What is the main idea of the passage?
What made recycling a major factor on the urban scene in 1970s?

选项 A、Financial viability in the 1960s.
B、Tax incentives and rapid depreciation.
C、Growing interest in ecology issues.
D、Both B and C.

答案D

解析
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