A．Because man has a strong desire for a modem way of life.B．Because pollution is caused by man.C．Because people from the countryside rush into the cities.D．Because people are not aware of the benefits of modern society.
A．Because man has a strong desire for a modem way of life.
B．Because pollution is caused by man.
C．Because people from the countryside rush into the cities.
D．Because people are not aware of the benefits of modern society.