gre考试阅读真题解析(A)_GRE阅读

　　 variables that benefit life are causing global temperature to increase

　　 beneficial substances that are not heat-trapping gases and that contribute to global temperature increase have been found in the Vostok ice core

　　21. It can be inferred from the passage that a long-term decrease in the concentration of carbon dioxide in the Earths atmosphere would

　　 increase methane concentration in the Earths atmosphere

　　 accompany a period of glaciation

　　 encourage the formation of more oxygen isotopes in the Earths atmosphere

　　 promote the formation of more water in the Earths global environment

　　 increase the amount of infrared radiation absorbed by the Earths atmosphere

　　22. The passage suggests that when the methane concentration in the Earths atmosphere decreases, which of the following also happens?

　　 Glaciers melt faster.

　　 The concentration of carbon dioxide increases.

　　 The mean global temperature decreases.

　　 Carbon dioxide absorbs more radiant beat.

　　 More clouds form in the Earths atmosphere.

　　23. In the fourth paragraph, the author is primarily concerned with

　　 restating the main idea of the passage

　　 using research findings to develop a simulation model

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