1. From the second paragraph we can learn .
A. actually rivers give off much more nitrous oxide than expected
B. scientists’ calculation is totally wrong
C. human activities release nitrous oxide in to the rivers
D. there is no nitrogen in fertilizer
2. Which of the following is NOT the source of nitrogen?
A. Fertilizer use.
B. Sewage discharges.
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】1—4、ADDA
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