【正确答案】 B

【答案解析】[听力原文]
The United States owes its high level of development to many factors. But in the last 100 years, it has been the workingman that was the backbone of the nation. What is the American workingman? He"s a worker in a shoe factory or meat packinghouse or a coal mine. But more than that, he"s a husband and a father. He raises his children to understand the value of a day"s work. He raises his children to respect the usefulness of cooperation. And he raises his children to help them better themselves. Frequently, his children go to college and leave the working class. But seldom do they forget the values they have learned at home. The workingman fought hard to achieve what he has. In the beginning, he was little more than a slave. Long hours" working in dirty dangerous surroundings for almost no pay took a heavy loss of lives. But the successful organization of labor unions changed many of the terrible conditions of his life. Today the workingman is faced with a new kind of struggle. Ever-advancing technology is taking his job. It"s very likely that the workingman will be replaced by a machine. But what he will leave will not be forgotten. He has served his country well. His country owes him a debt which can never be repaid.

What is one of the major things the workingman teaches his children?