5. 选择题: 1. C. keeps 空气使它们高高地飞翔。 2. B. or 空气没有颜色或形状。 3. C. was, is 这里的空气过去很干净,但现在有时很脏。 4. A. fresh 我们应该打开窗户保持教室空气新鲜。 5. B. make 不要扔石头,那会使妈妈生气。反馈 收藏 ...
What is air? It has no colour, smell or taste. We can feel it. When it moves, it becomes wind. Air is important to the world. People need it. Animals need it. Plants need it too. So we must keep the air clean and fresh. Don't smoke. Don't drive to school or work if you...
Environment includes both in the air, water, land, plants, animals, etc for the content of the material factors, including such as idea, system, the code of conduct for content of non-material factors; Both natural factors and social factors; Both the life form, also include the life forms...
Environment includes both in the air, water, land, plants, animals, etc for the content of the material factors, including such as idea, system, the code of conduct for content of non-material factors; Both natural factors and social factors; Both the life form, also include the life ...
The AirAir is very important to us.We can breath and live with air.But the air in our city is dirty now.Cars,people's activities and other reasons make the air dirty.So weshouldoften go out by bus.We should drive less.We can also plant more trees to make our air clean.空气空气对...
Air pollution is the introduction of foreign products into the atmosphere that have determintal effects on living organisms and cause damage to the environment. Causes and Effects of Air Pollution Vehicles release chemicals in the form of exhaust fumes. These chemicals are very harmful to the enviro...
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 ...
Environment, health and safety (EHS) is a multidisciplinary field that focuses on the protection of human health and the environment.
have recently gained recognition as pollutants by some scientists. Others recognize the gas as being essential to life and therefore incapable of being classed as a pollutant.参考:Air pollution is a chemical physical (e.g. particulate matter)or biological agent that modifies the natural ...
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