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...
1）通读，看大意：占据71%地球表面的海洋，在维持人类生存环境、调节气温、水循环方面扮演重要角色；2）...
Infact,nineoftheexpertsjudgedtheprobabilityofsucha"basicstatechange"in theatmospheretobeat least90percent,ormore. 实际上,其中9位专家认为大气层出现这种“根本的状态变化”的可能性至少是90%,甚至更大。 article.yeeyan.org 2. Up tonow,newschool studentsofcompulsory educationin90percentofthecounties inthecou...
" The thin atmosphere on Mars is 96 percent carbon dioxide and much more(7) changeable( change) than on Earth and the temperature can vary by 100 degrees,"Hoffman said."One aim is to show we can run Moxie in all seasons." The device,Moxie,uses some special pumps,(8...
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...
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...
Organic farming also increases the amount of absorbing carbon, a process where carbon dioxide (CO2) is "absorbed" out of the atmosphere and captured by plants and stored in the soil. However, even a total change to organic farming would only be equal to a tiny part of the higher emissions...
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)、...
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 competence and based on a change in the political role offers at least the chance of ...