The third-most abundant gas in the air on Earth is argon, although it makes up less than 1 percent of air. Argon is classified as a noble gas in chemistry, meaning it is very stable and seldom reacts with other compounds. The argon in the air comes mainly from the decay of potassium...
Oxygen is the second most abundant gas in the atmosphere but the third most abundant chemical in the universe, after hydrogen and helium. Oxygen is prevalent in the Earth's air, sea and land, accounting for a remarkable 88.8 percent of the mass of the Earth's oceans. It is colorless and...
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。
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 ...
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 选项种更...
I was halfway back to the cottage where my mother lived ___ Susan caught up with me. A. though B. until C. when D. while 点击展开完整题目 查看答案和解析>> 科目:高中英语来源:题型:单选题 The knife ___ we cut the bread is very sharp. A. with which ...
The article offers information about the hazardous chemicals in indoor air. Acrolein is considered as the one of hazardous chemical that comes from the products of combustion. Many hazardous chemicals that belong to the special class of smelly compounds including aldehydes, formaldehyde and etaldehyde ...