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.
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According to the first paragraph, Aerographite is
A. six times lighter than the last record-holder.
B. created by American researchers in Hamburg.
C. the lightest material in the world so far.
D. less than a quarter the weight of air.
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.
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.
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