无锡市2015高考英语短文改错及阅读理解训练(6)(12)

D. it has much more warming potential than carbon dioxide

4. What does the passage mainly tells us?

A. Rivers may be a source of the greenhouse gas nitrous oxide.

B. It’s human activities that release nitrogen into the environment.

C. How to reduce nitrous oxide emissions from river networks

D What to do with the climate change caused by nitrous oxide.

【参考答案】4.ADDA

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