The word "capped"(Line 4, Para.1)most probably means
A.sealed.
B.topped.
C.unchanged.
D.lowered.
第1题
Which of the following would be the best title for the passage?
A.History of Methane Researches
B.Variety of Methane Sources
C.Plant Producing Methane
D.Microbe Producing Methane
请帮忙给出正确答案和分析,谢谢!
第2题
From the last paragraph we can learn that
A.500 million to 600 million metric tons methane are produced yearly.
B.the production of methane increased by 10% and 30%.
C.experts are cautious about lab and field experiments.
D.there is no definite answer to plant methane production at present.
请帮忙给出正确答案和分析,谢谢!
第3题
According to the experiments conducted by Frank Keppler and his colleagues,
A.living plants produce a high rate of methane.
B.dead plants produce a high rate of methane.
C.methane mainly comes from burning biomass.
D.methane can only be produced hydroponically.
请帮忙给出正确答案和分析,谢谢!
第4题
We can learn from the second paragraph that
A.microbes like to live in oxygen-poor environments.
B.people know less about plant methane production.
C.methane can be made into natural gas.
D.methane is always produced in quantities.
请帮忙给出正确答案和分析,谢谢!
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