gre考试阅读真题解析(A)_GRE阅读

　　 The Earths atmosphere now contains more than twice as much methane as it does carbon dioxide.

　　 The higher the concentration of carbon dioxide in the Earths atmosphere, the lower the concentration of methane.

　　 Most of the global warming that has occurred during the past 10 years has been associated with increased methane concentration.

　　19. According to the passage, which of the following statements best describes the relationship between carbon dioxide and global temperature?

　　 Carbon dioxide levels change immediately in response to changes in temperature.

　　 Carbon dioxide levels correlate with global temperature during cooling periods only.

　　 Once carbon dioxide levels increase, they remain high regardless of changes in global temperature.

　　 Carbon dioxide levels increase more quickly than global temperature does.

　　 During cooling periods, carbon dioxide levels initially remain high and then decline.

　　20. The author mentions certain positive feedbacks in order to indicate that

　　 increased concentration of carbon dioxide in the Earths atmosphere is responsible for global temperature increase

　　 some climate simulation models have produced useful information

　　 greenhouse gases alone do not account for global temperature increase

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