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单选题
The primary purpose of the passage is to _____.
A
warn of the dangers of continued burning of fossil fuels
B
discuss the significance of the amount of carbon dioxide in the atmosphere
C
demonstrate the usefulness of mathematical models in predicting long-range climatic change
D
describe the ways in which various atmospheric and climatic conditions contribute to the Earth’s weather
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解析：
文章第一段讲述了大气中二氧化碳的存在对于保持地表温度平衡的重要作用，接着讲述了如今由于化石燃料的燃烧，使大气中的二氧化碳增多，从而对全球气温以及人类社会的影响，主要是为了强调二氧化碳在大气中的重要作用，因此B项最符合题意。A、C、D三项在文中都有所体现，但都不是文章主旨，因此不选。
文章第一段讲述了大气中二氧化碳的存在对于保持地表温度平衡的重要作用，接着讲述了如今由于化石燃料的燃烧，使大气中的二氧化碳增多，从而对全球气温以及人类社会的影响，主要是为了强调二氧化碳在大气中的重要作用，因此B项最符合题意。A、C、D三项在文中都有所体现，但都不是文章主旨，因此不选。
更多 “单选题The primary purpose of the passage is to _____.A warn of the dangers of continued burning of fossil fuelsB discuss the significance of the amount of carbon dioxide in the atmosphereC demonstrate the usefulness of mathematical models in predicting long-range climatic changeD describe the ways in which various atmospheric and climatic conditions contribute to the Earth’s weather” 相关考题
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