The first step to solve air pollution is assessment.

According to the speaker, what is the feature of air pollutants？A．Its contents often remai

What is the newest problem facing people who drive to school？A．Pollution in the air.B．A la

What is the first thing that people ought to do in face of pollution, according to the aut

Which one is true about identifying the first step according to the article？A.We can

If we want to solve a problem the first step is t

If we want to solve a problem the first step is t