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单选题
It can be inferred from the passage that_____.
A
the developing world has decided to increase its energy consumption
B
a third-world citizen adds less than a ton of CO2 yearly to the atmosphere
C
the world climate would soon gain its balance if we stopped greenhouse-gas emissions
D
future prosperity of the world is dependent on cheap fossil fuels
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解析：
根据Excerpt 4第二段中的“The average rich world resident adds about 3.2 tons of CO2 yearly to the atmosphere, more than four times the level added by each Third World citizen.”可知，第三世界国家每人每年向大气中排放的二氧化碳不足3.2吨的四分之一，也就是不到一吨的二氧化碳。故B项为正确答案。
根据Excerpt 4第二段中的“The average rich world resident adds about 3.2 tons of CO2 yearly to the atmosphere, more than four times the level added by each Third World citizen.”可知，第三世界国家每人每年向大气中排放的二氧化碳不足3.2吨的四分之一，也就是不到一吨的二氧化碳。故B项为正确答案。
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