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[主观题]
______is a good method of supplying energy to remote areas？A．B．C．D．
______is a good method of supplying energy to remote areas？
A．
B．
C．
D．
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
______is a good method of supplying energy to remote areas？
A．
B．
C．
D．
如果结果不匹配，请 联系老师 获取答案
更多“______is a good method of supp…”相关的问题
A.addition
B.association
C.application
D.affection
The best tide for this passage could be ______.
A．Nature Is Beyond Human's Control
B．No Method or Stronger Structures Are Founds to Predict and Withstand Quakes
C．Can't We Predict Earthquakes？
D．Earthquake, Hard to Predict!
Plant Gas
Scientists have been studying natural sources of methane for decarlesd but hadn’t regarded plants as a produeer，notes Frank Keppler，a geochemist at the Max Planck Institute for Nuelear Physics in Heldelberg，Germany1 ． Now Keppler and his colleagues nnd that plants，from grasses to trees，may also be sources of the greenhouse gas． This is really surprising，hecause most scientists assumed that methane production requires an oxygen—free environment．
Previously，researchers had thought that it was impossible for plants t0 make significant amounts of the gas． They had assumed that microhes2 need t0 he in environments without oxygen to prodnee methane． Methane is a greenhouse gas．1ike carbon dioxide． Gases sueh as methane and carhon dioxide trap heat in Earth’s atmosphere and contn‘hute to glohal warming．
In its experiments，Keppler’s team used sealed chambers that contained the same concentration of oxygen that Earth’s atmosphere has．They measured the amounts of methane that were released by both living plants and dried plant material，such as fallen leaves．
With the dried plants，the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C．At 30 degrees C，they found，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．the amount of methane released each hour roughly doubled．
Living plants growing at their normal temperatures released as much as 370 nanograms of meth’ane per gram of plant tissue per hour．Methane emissions tripled when living and dead plant was ex。posed to sunlight．
Because there was plenty of oxygen available，it’s 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．That’s another strong sign that the gas came from the plants and not soil microbes．
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 consum~’methane，they may prevent plant-produced methane from reaching the atmosphere．Field tests will be needed to assess the plant’s influence，she notes．
第 36 题 What was scientists’understanding of methane？
A．It was produced from plants．
B．It was not a greenhouse gas．
C．It was pmduced in OXygen－free environments．
D．It traps more heat than any other greenhouse gas．
The author thinks qualified life comes from ______.
A．a good job
B．a good aim
C．a good society
D．the way a man's mind works
The girl eating in the restaurant seems ______ a good time. (have)
Peter thought the lecture ______.
A．was a good one
B．was terrible
C．wasn't so good
"If it sounds too good to be true, it is" means
A．when something good happens, it is expected to be true.
B．something unbelievably good usually proves to be untrue.
C．it is indeed good, though you can not believe it.
D．something that is true always sounds good.
