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 ...
air为先行词,逗号后面的为非限制性定语从句,从句中breathe缺少宾语,所以答案为关系代词。what不能引导定语从句;when作为关系副词在句中做状语;that不能引导定语从句;which是关系代词,能引导限制性和非限制性定语从句。故选B。 结果一 题目 Air,___ we breathe every day, is necessary to life.A.whatB.whichC...
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...
百度试题 结果1 题目( A )1.-is air important?-Because we need it to breathe. A. Why B. What C. How 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
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
Sherman, Max
the hills have been cut down, and waste water is being poured continuously in to rivers. Furthermore, wherever we go today, we can find rubbish carelessly disposed. The whole ecological balance of the earth is changing. Massive destruction of environment has brought about negative effects and ...
What is the pressure dew point for compressed air? Composition of Air and Partial Pressures The air we breathe is made up of three primary gases, nitrogen, oxygen, and argon. The total atmospheric pressure is the sum total of the partial pressure of all the gases, so at 100kPa of pressur...
Chemistry is the study of matter and how it changes. Matter is everything that has mass and takes up space, like the air we breathe, the water we drink, and the objects we use every day. Chemistry helps us understand what things are made of and how they interact with each other. ...
Air, however, is relatively constant in its composition, though its quality can be affected by factors like pollution, altitude, and humidity. 6 Wind plays a crucial role in weather systems and climate patterns, facilitating the transfer of heat and moisture across different regions. Air serves ...