C. Fossil fuel combustion.
D. Climate change.
3. Nitrous oxide is a powerful greenhouse gas because .
A. it can protect us from the sun’s harmful ultraviolet radiation
B. it is to blame for most of human-induced climate change
C. it is a far more common greenhouse gas
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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