Which statement is true of the methane emissions of plants in the experiment?
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A a rail B an engine C a retractable arm D a computer controller
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3 .What is the author's attitude toward the future of autos?
A Enthusiastic B Pessimistic C optimistic D Cautious
4 .What was scientists' understanding of methane?
A It was produced from plants. B It was not a greenhouse gas. C It was produced in oxygen-free environments. D It traps more heat than any other greenhouse gas.
5 .To test whether plants are a source of methane, the scientists created_____.
A a oxygen-free environment B an environment with the same concentration of oxygen as the Earth has C a carbon dioxide-free environment D an environment filled with the greenhouse gas
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A Plants growing in soil release methane. B Plants growing in water release methane. C Soil microbes consume methane. D Microbes in plants produce methane.
8 .What is the beneficial point of some microbes consuming plant-produced methane?
A Methane becomes less poisonous. B methane is turned into a fertilizer. C Less methane reaches the atmosphere. D Air becomes cleaner.
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A Traffic accidents are mainly caused by motorists. B Thousands of people the world over are killed each year. C The laws of some countries about driving are too lax. D Only stricter traffic laws can prevent accidents.
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