What was scientists' understanding of methane?
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1 .One significant improvement in the future car will probably be_____.
A its power source B its driving system C its monitoring system D its seating capacity
2 .What is the author's main concern?
A How to render automobiles pollution-free. B How to make smaller and safer automobiles. C How to solve the problem of traffic jams. D How to develop an automated subway system.
3 .What provides autos with electric power in an automated highway system?
A a rail B an engine C a retractable arm D a computer controller
4 .In an automated highway system, all the drivers need to do is_____.
A keeping in the right lane B waiting to arrive at his destination C keeping in constant touch with the computer center D informing the system of his destination by phone
5 .What is the author's attitude toward the future of autos?
A Enthusiastic B Pessimistic C optimistic D Cautious
7 .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
8 .Which statement is true of the methane emissions of plants in the experiment?
A The lower the temperature, the higher the amount of methane emissions. B Living plants release less methane than dried plants at the same temperature. C When exposed to sunlight, plants stop releasing methane. D The higher the temperature, the greater the amount of methane emissions.
9 .Which of the following about methane is not mentioned in the passage?
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.
10 .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.
