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

　　阅读下列短文，从每题所给的四个选项（A、B、C和D)中，选出最佳选项。

　　Since the beginning of the year, smog has covered parts of North China. In January, Beijing saw only five days without smog. The rising PM 2.5 readings terrified many people, and some health experts said that whenever the smog gets serious, hospitals receive more patients suffering acute respiratory（呼吸系统）and heart diseases.

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