Our surroundings are being polluted faster than man's present efforts to prevent pollution. Time is bringing us more people, and more people will bring us more industry, more cars, larger cities and the growing use of man-made materials.  What can explain and solve the problem? The fact is that pollution is caused by man--by his desire for a modern way of life. We make "increasing industrialization" our chief aim. So we are often ready to offer everything:clean air,pure water,good food,our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of our modern society. But as our technological achievements have grown in the last twenty years,pollution has become a serious problem.  Isn't it time we stopped to ask ourselves where we are going--and why? It makes one think of the story of the airline pilot  who told his passengers over the loudspeaker, "I've some good news and some bad news. The good news is that we are making rapid progress at 530 miles per hour. The bad news is that we are lost and can't know where we are going." The sad fact is that this becomes a true story when we speak of our modern society. According to the writer,more and more people crowd into large cities because they   _  .
are tired of their present life want to help find a comfortable place to work in hope to change their way of life wish to enjoy the achievements of the society