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发布时间：2006-06-22 13:31     点击：

　　(C) explain how a constant temperature is maintained on the Earth's surface

　　(D) describe the ways in which various atmospheric and climatic conditions contribute to the Earth's weather

　　(E) 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

　　(A) concentrated in the infrared spectrum

　　(B) concentrated at visible wavelengths

　　(C) absorbed by carbon dioxide molecules

　　(D) absorbed by atmospheric water vapor

　　(E) reflected back to space by snow and ice

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

　　EXCEPT

　　(A) absorbing radiation at visible wavelengths

　　(B) absorbing infrared radiation

　　(C) absorbing outgoing radiation from the Earth

　　(D) helping to retain heat near the Earth's surface

　　(E) helping to maintain a constant average temperature on the Earth's surface

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

　　(A) Incredulous  (B) Completely detached

　　(C) Interested but skeptical

　　(D) Angry yet resigned

　　(E) 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

　　(A) 15℃  (B) 9℃  (C) 2.5℃

　　(D) -12℃  (E) -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?

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