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.
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What can be inferred from the third paragraph？
A. Obesity and lack of exercise have only a little to do with cancer.
B. Anne McKiernan has proved that the obese and inactive are more susceptible in the trial.
C. The bodywide inflammation has nothing to do with the growing of cancer.
D. The government also plays its part in helping prevent diseases.
According to the passage, which of the following is NOT true？
A. You can"t get the DVD extras online because you pay less than rent a DVD.
B. You have to finish the DVD within one day when renting it online.
C. Some classical movies are still unavailable even after they are finished in the theatres.
D. New movies can be seen only some time after their release.
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
掘进中的岩巷允许风速最高为()m/s。
A. 4
B. 5
C. 6
D. 8
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