What does the author mainly discuss in the text?A. Technology. B. Sustainability.C. Et

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What does the author mainly discuss in the text?

A. Technology. B. Sustainability.

C. Ethanol energy. D. Environmental protection.

请帮忙给出正确答案和分析,谢谢!

热搜:一个c程序的执行是从本程序的main函数开始