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2019 高考英语专题复习之高效精读策略专项练习

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中国现代教育网
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             中国现代教育网  www.30edu.com  全国最大教师交流平台

                      高效精读策略专项练习

    Rivers may be a significant source of the greenhouse gas nitrous 
oxide (一氧化二氮), scientists now find.
    Their calculation suggests that across the globe the waterways 
contribute three times the amount of nitrous oxide to the atmosphere as 
had been estimated by the International Panel on Climate Change (IPCC), 
the United Nations scientific body charged with reviewing climate 
change research. They found that the amount of nitrous oxide produced in 
streams is related to human activities that release nitrogen (氮) into the 
environment, such as fertilizer use and sewage discharges.  [来源:学|科
|网][来源:学&科&网]
    “Human activities, including fossil fuel combustion and intensive 
agriculture, have increased the availability of nitrogen in the 
environment,” said Jake Beaulieu of the University of Notre Dame and 
the U.S. Environmental Protection Agency in Cincinnati, Ohio, and lead 
author of the paper published this week in the journal Proceedings of the 
National Academy of Sciences.  
    “Much of this nitrogen is transported into river and stream 
networks,” Beaulieu said. There, microbes (微生物) convert the nitrogen 
into nitrous oxide (also called laughing gas) and an inert gas called 
dinitrogen (二氮).   
    The finding is important, the researchers say, because nitrous oxide 
is a powerful greenhouse gas that contributes to climate change and 
destruction of the stratosphere’s ozone layer, which protects us from the 
sun’s harmful ultraviolet (紫外线) radiation. Compared with carbon 
dioxide, nitrous oxide is 300-fold more powerful in terms of its warming 
potential, though carbon dioxide is a far more common greenhouse gas. 
Scientists estimate nitrous oxide accounts for about 6 percent of human-
induced climate change.   
    Beaulieu and colleagues measured nitr ous 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. 
             中国现代教育网  www.30edu.com  全国最大教师交流平台


  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 [来源:
Zxxk.Com]
    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___________.  
[来源:学#科#网]

    A. it can protect us from the sun’s harmful ultraviolet radiation [来
源:Zxxk.Com]
    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.
                    中国现代教育网         www.30edu.com    全国最大教师交流平台


                                             参考答案


1. A   2.  D  3. D   4. A
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