What is the talk mainly about
A: The definition of air pollutant.
B: The causes of air pollution.
C: The dangers of air pollutants.
D: Ways to fight air pollution.
A: The definition of air pollutant.
B: The causes of air pollution.
C: The dangers of air pollutants.
D: Ways to fight air pollution.
举一反三
- What is the first thing that people ought to do in face of pollution, according to the author A: To see the sky outside in the morning. B: To walk outside to see the colored sun. C: To take care of, and prevent air pollution now. D: To analyse the different layers of air pollution.
- Which of the following titles is a proper one? A: What should we do to prevent air pollution? B: An Exploration into the Measures to Prevent Air Pollution C: How does air pollution happen? D: Computer Retrieval
- Noise pollution generally receives less attention than ______ air pollution. A: does B: it does C: receives D: it does over
- 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
- It is reported that air pollution affects rivers and lakes indirectly because it causes acid rain.