What is the main gas in the air we breathe? A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen 相关知识点: 试题来源: 解析 B。我们呼吸的空气中主要气体是氮气。A 选项氧气是维持生命所必需的,但不是空气中的主要气体;C 选项二氧化碳含量较少;D 选项氢气在空气中含量极少。本题考查空气的成分。
The air we breathe is a mixture of gases. What is air? A. A liquid B. A gas C. A solid D. A powder 相关知识点: 试题来源: 解析 B。我们呼吸的空气是气体的混合物。选项 A 液体错误;选项 C 固体错误;选项 D 粉末错误。反馈 收藏 ...
1Air,___ we breathe every day, is necessary to life.A.whatB.whichC.thatD.when 2 Air,___ we breathe every day, is necessary to life. A. what B. which C. that D. when 3【题目】Airwe breathe every day, isnecessary to life. A.whatB.whichC. thatD. when 反馈 收藏 ...
百度试题 结果1 题目fresh air we breathe! A. What B. What a C. How D. How a 相关知识点: 试题来源: 解析 A 反馈 收藏
百度试题 结果1 题目Air,___ we breathe every day, is necessary to life. A. what B. which C. that D. when相关知识点: 试题来源: 解析 B 反馈 收藏
解析 11.D句意:我们今天呼吸的是多新鲜的空气啊!感叹句结构为: H_2w+adj./ad .+主语+谓语!”或“What +adj.+可数名词复数/不可数名词+主语+谓语!”或⋅⋅⋅Whata/an+adj .+可数名词单数+主语+谓语!”。此处的“air”为不可数名词,需要用 what来引导感叹句。
题目The air we breathe is polluted. What can we do to improve air quality? A. Burn more fossil fuels. B. Plant fewer trees. C. Use more cars. D. Ride bikes or walk. 相关知识点: 试题来源: 解析 D。为了改善空气质量,我们可以骑自行车或步行。A 选项燃烧更多化石燃料会加重污染;B 选项种...
Now, don’t be mistaken. There are other greenhouse gases (nitrogen, methane, and even water vapor) that we could spend time focusing on too, but let’s just stick to carbon right now. What can we do? It’s no secret that lowering levels of atmospheric carbon is a *hot* topic (pun...
Air is a mixture of gases primarily nitrogen and oxygen essential for respiration, whereas the atmosphere is Earth's protective layer of gases, encompassing air, water vapor, and other components.
The Earth's atmosphere is as large as it is invisible. A huge bubble of gases surrounds the Earth that humans and animals rely on to stay alive, but do not see or interact with consciously. Despite this invisibility, there's a lot more to the Earth's atm