Nick : Ah, welcome back. Let's learn about
pollution. We all face the problems
of pollution. Do you know why ?
Geoff : No, why is that ?
Nick : Well, pollution changes the conditions that we
depend on . Polluted air makes us sick.
Devi : It's bad for our health.
Nick : Let's go.
Pollution changes conditions
·ÕèÁÒ videoCD Dynamic English