Beaulieu and colleagues measured nitrous oxide production rates in 72 streams. When summed across the globe, the results showed rivers and streams are the source of at least 10 percent of human-caused nitrous oxide emissions to the atmosphere.

　　“Changes in agricultural and land-use practices that result in less nitrogen being delivered to streams would reduce nitrous oxide emissions from river networks,” Beaulieu said.

　　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?

【2016届高考英语二轮复习阅读理解一百四十集选练：（137）】相关文章：

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修5 Unit 3 Life in the future

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习完形填空专题训练：技法2 利用语义逻辑关系解题（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：解题技巧（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：应试策略（含解析）

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（23）及答案

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练二

★ 2017高考四川省广安市英语阅读理解一轮系列训练：11（含解析）

★ 四川省广安市2014高考英语一轮基础训练题（9）及答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (45)

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 4 B卷 Word版含解析