A. oxygen (氧气) B. carbon dioxide (二氧化碳) C. nitrogen (氮气) D. hydrogen (氢气) 相关知识点: 试题来源: 解析 C 正确答案:C 解析:大气的主要成分是氮气(nitrogen)哦,大概占大气总成分的78%左右, 而氧气(oxygen)只占20%左右,剩余的2%由二氧化碳(carbon dioxide)等其他气体组成。反馈...
Carbon dioxide makes up less than one percent of the Earth’s atmosphere. But the gas is very important to life on Earth. Scientists are finding that processes involving carbon dioxide affect our climate in ways that are difficult to understand. Last month, a committee of the National Academy...
Carbon dioxide makes up less than one percent ofthe Earth's atmosphere. Butthe gas isvery importat to ife on Earth. Scintist are fnding thtprocesse involving carbon dioxideaffect our climate in ways that are difficut to understand. Last month, a committee of theNational Academy of Sciences...
根据文章第二段“Growing and harvesting beans requires energy which releases a lot of carbon dioxide(CO2)into the atmosphere(种植和收获豆类需要能量,而能量会向大气中释放大量二氧化碳)”可知,此处说明咖啡产业会产生碳排放。故选C项。 (2)题详解: 细节理解题。根据文章第二段“A not-so-fun fact is ...
根据第一段中的“We all think plants were expected to get larger with increased carbon dioxide in the atmosphere, but changes in temperature, humidity(湿度)and nutrient availability seem to have trumped the benefits of increased carbon dioxide”可知科学家原来以为二氧化碳的增加会导致物种变大,但是气候...
ai would like weeping with the smile rather than repenting 正在翻译,请等待...[translate] awhat factors led to the steadily rising concenteation of carbon dioxide in the atmosphere 正在翻译,请等待...[translate] aA development coalition between politics and administration with an increase in overall...
句子 The burning of fossil fuels and the clearing of forests have increased atmospheric carbon dioxide by about 15 percent in the last hundred years, and we continue to add carbon dioxide to the atmosphere. 问题 句子分析(俗称“长难句分析”)是训练提高基础阅读能力的有效手段。我们通过对托福(TOEFL...
Higher carbon dioxide levels have shift ed the chemistry of the ocean, making it more acidic, and corals and sea creatures have trouble growing in acidic conditions.(政府间气候变化专门委员会预测,如果全球变暖达到1.5℃,高达90%的珊瑚礁可能会消失。珊瑚陷入困境的另一个原因是海洋酸化。更高的二氧化碳...
Pinatubo in 1991, actually lead to short-term global cooling, not warming, as sulfur dioxide (SO2), ash and other particles in the air and stratosphere(平流层) reflect some solar energy instead of letting it into Earth's atmosphere. SO2, which converts to sulfuric acid aero...
"This is the first demonstration of actually using resources on the surface of Mars and transforming(5) them( they) chemically into something useful for a human mission," Jeffrey Hoffman,a(6) retired( retire) astronaut,said. " The thin atmosphere on Mars is 96 percent car...