The great treasure of America is not the land，as bountiful as it is.Nor is it the gold and paper currency in bank vaults.
America’s greatest treasure can be found in any telephone directory that lists a representative sample of the millions of skilled working men and women who make this country go.
As with most blessings，we take these people for granted.Were it not for this great army of people who know how to do things and how to do them fight America would collapse overnight.But they are mostly absent from television，movies and newspapers.When a new high -rise office complex is announced，the emphasis is on who will occupy it and who is financing it，Virtually nothing is said about the team of workers who，from bare ground and blueprints，will build it.
Those in the building trades are only part of the treasure.The millions of men and women who make our industries，businesses and service organizations work are also part of this largely untold story.
It’s fashionable these days to talk about American’s decline.It’s also fashionable to talk about the loss of the work ethic.Fashionable bunk.
America is not in decline.Since 1982the economy has grown at an impressive average annual rate of four percent；and the productivity of workers in our manufacturing industries has risen at the fastest rate since World War II——averaging an unheard-of five percent a year.
Nor has our work ethic dropped off.More Americans are working now than ever，and the unemployment rate is the lowest it has been in over 15years.Look away from the TV screen at the real world.What do you see？Men and women，working day and night，seven days a week.They are the heart that pumps life into the American economy.

According to this passage, the great treasure of America is（）