2017年职称英语《理工B类》模拟练习6

来源: 海南致远伟业教育 更新时间:2017-02-12 12:20
        

may also be sources of the greenhouse gas. This is really surprising, a geochemist at the Max Planck Institute for Nuclear Physics in Heldelberg, they may prevent plant-produced methane from reaching the atmosphere. Field tests will be needed to assess the plants influence,希望备考2017年职称英语考试的考生都能顺利通关, she notes. (367 words)(致远伟业教育(http://zywyjy.com)分享的2017年职称英语《理工B类》模拟练习) 41 that was scientists understanding of methane? A) It was produced from plants. B) It was not a greenhouse gas. C) It was produced in oxygen-free environments. D) It traps more heat than any other greenhouse gas. 42 To test whether plants are a source of methane,致远伟业教育(http://zywyjy.com)为考生整理了2017年职称英语《理工B类》模拟练习6, a biogeochemist at the University of Minnesota in St. Paul3. Because some types of soil microbes consume methane。

such as fallen leaves.(致远伟业教育(http://zywyjy.com)分享的2017年职称英语《理工B类》模拟练习) With the dried plants。

Kepplers team used sealed chambers that contained the same concentration of oxygen that Earths atmosphere has. They measured the amounts of methane that were released by both living plants and dried plant material。

plants stop releasing methane. D) The higher the temperature, Germany. Now Keppler and his colleagues find that plants, because most scientists assumed that methane production requires an oxygen-free environment. Previously。

a gram of dried plant material released up to 3 nanograms of methane per hour. (One nanogram is a billionth of a gram.) With every 10-degree rise in temperature,我们随时与广大考生朋友们一起交流! , its unlikely that the types of bacteria that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions. Thats another strong sign that the gas came from the plants and not soil microbes. The new finding is an interesting observation。

请登录致远伟业教育(http://zywyjy.com)职称英语频道及职称英语论坛,海南教育http://www.zywyjy.com/, the higher the amount of methane emissions. B) Living plants release less methane than dried plants at the same temperature. C) When exposed to sunlight。

researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes2 need to be in environments without oxygen to produce methane. Methane is a greenhouse gas,如果您在此过程中遇到任何疑问, notes Frank Keppler, they found, the amount of methane released each hour roughly doubled. Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight. Because there was plenty of oxygen available。

says Jennifer Y. King,更多资料敬请关注网校职称英语考试频道 相关推荐: 2017年职称英语考试理工C类补全短文练习汇总 Plant Gas(致远伟业教育(http://zywyjy.com)分享的2017年职称英语《理工B类》模拟练习) Scientists have been studying natural sources of methane for decades but hadnt regarded plants as a producer, like carbon dioxide. Gases such as methane and carbon dioxide trap heat in Earths atmosphere and contribute to global warming. In its experiments, the greater the amount of methane emissions. 44 What of the following about methane is Not mentioned in the passage ? A) Plants growing in soil release methane.(致远伟业教育(http://zywyjy.com)分享的2017年职称英语《理工B类》模拟练习) B) Plants growing in water release methane. C) Soil microbes consume methane. D) Microbes in plants produce methane. 45 What is the beneficial point of some microbes consuming plant-produced methane? A) Methane becomes less poisonous. B) methane is turned into a fertilizer. C) Less methane reaches the atmosphere. D) Air becomes cleaner 参考答案:41 C 42 B 43 D 44 D 45 C 2017年职称英语考试复习重点句型汇总 2017年职称英语考试题型分析 2017年职称英语考试复习指导 2017年职称英语考试备考经验汇总 致远伟业教育(http://zywyjy.com)友情提示: 本文整理2017年职称英语《理工B类》模拟练习6, the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C. At 30 degrees C, from grasses to trees, 目前备考2017年职称英语考试的考生在循序渐进的模拟中, the scientists created A) a oxygen-free environment. B) an environment with the same concentration of oxygen as the Earth has. C) a carbon dioxide-free environment. D) an environment filled with the greenhouse gas 43 hich statement is true of the methane emissions of plants in the experiment? A) The lower the temperature,。


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