gre阅读练习每日一篇(二十六)_GRE阅读

　　17. The primary purpose of the passage is to

　　 warn of the dangers of continued burning of fossil fuels

　　 discuss the significance of increasing the amount of carbon dioxide in the atmosphere

　　 explain how a constant temperature is maintained on the Earths surface

　　 describe the ways in which various atmospheric and climatic conditions contribute to the Earths weather

　　 demonstrate the usefulness of mathematical models in predicting long-range climatic change

　　18. According to the passage, the greatest part of the solar energy that reaches the Earth is

　　 concentrated in the infrared spectrum

　　 concentrated at visible wavelengths

　　 absorbed by carbon dioxide molecules

　　 absorbed by atmospheric water vapor

　　 reflected back to space by snow and ice

　　19. According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT:

　　 absorbing radiation at visible wavelengths

　　 absorbing infrared radiation

　　 absorbing outgoing radiation from the Earth

　　 helping to retain heat near the Earths surface

　　 helping to maintain a constant average temperature on the Earths surface

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