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How much were the CO2 levels before the Industrial Revolution？A．400 parts per million.B．28

2024-07-29 14:43:15 外语考试 阅读

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How much were the CO2 levels before the Industrial Revolution？

A．400 parts per million.

B．280 parts per million.

C．120 parts per million.

D．680 parts per million.

请帮忙给出正确答案和分析，谢谢！

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