gre阅读练习每日一篇(二十六)_GRE阅读

gre阅读练习每日一篇(二十六)

　　20. Which of the following best describes the authors attitude toward the increasing amount of carbon dioxide in the atmosphere and its consequences?

　　 Incredulous

　　 Completely detached

　　 Interested but skeptical

　　 Angry yet resigned

　　 Objective yet concerned

　　21. It can be concluded from information contained in the passage that the average temperature at an altitude of 1 kilometer above the Earth is about

　　 15℃

　　 9℃

　　 2.5℃

　　 -12℃

　　 -18℃

　　22. It can be inferred from the passage that the construction of the mathematical model mentioned in the passage involved the formulation of which of the following?

　　 An assumption that the amount of carbon dioxide added to the atmosphere would in reality steadily increase

　　 An assumption that human activities are the only agencies by which carbon dioxide is added to the atmosphere

　　 Assumptions about the social and political consequences of any curtailment of the use of fossil fuels

　　 Assumptions about the physical conditions that are likely to prevail during the period for which the model was made

　　 Assumptions about the differential behavior of carbon dioxide molecules at the various levels of temperature calculated in the model

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