The water (or snow) can become acidified when a pollutant combines with______ in the air.
举一反三
- What does the professor mean when he says this A: Little is known about defining a substance as an air pollutant. B: The substance isn’t an air pollutant when there is a very little in the air. C: The substance can’t be judged to be an air pollutant only from its actual concentration level. D: The actual concentration level means little to peopl
- Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.
- 16. Retained soil can become saturated ___ water and then exert tremendous pressure.
- You can put knives in your hand bag when you travel by air.
- This wonderful plane can carry seven passengers. The most surprising thing about it, however, is that it can land anywhere: on snow, water, or even on a ploughed field.