职称英语理工类C级阅读理解精华练习(3)

　　Plant Gas 　　In its experiments，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，such as fallen leaves. 　　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. 　　The new finding is an interesting observation, says Jennifer Y.King，a biogeochemist at the University of Minnesota in St.Paul3.Because some types of soil microbes consume methane，they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plants influence，she notes. 　　the Max Planck Institute for Nuclear Physics in Heidelberg，Germany：马克思普朗克核物理研究所，位于德国海德堡。海德堡系德国西南部城市，在巴登一符腾堡州的内卡河畔。海德堡大学是德国历史最悠久的大学。 　　St.Paul：圣保罗，美国明尼苏达州首府。 　　What was scientists understanding of methane? 　　B It was not a greenhouse gas. 　　D It traps more heat than any other greenhouse gas. 　　A a oxygen-free environment. 　　C a carbon dioxide-free environment. 　　Which statement is true of the methane emissions of plants in the experiment? 　　B I.iving plants release less methane than dried plants at the same temperature. 　　D The higher the temperature，the greater the amount of methane emissions. 　　A Plants growing in soil release methane. 　　C Soil microbes consume methane. 　　What is the beneficial point of some microbes consuming plant-produced methane? 　　B Methane is turned into a fertilizer. 　　D Air becomes cleaner.