【正确答案】 D

【答案解析】[听力原文] As every schoolboy knows, the important raw materials of industry are coal, oil and iron. However, as every businessman knows, the most important raw material of all is the schoolboy who, as a trained college graduate, will run the US industry of the future. Today the US industry is faced with a tight shrinkage of such manpower. It needs not only more but better trained college graduates. To help get them, many businessmen believe that corporations must provide much of the cash needed by colleges to expand their facilities and improve their teaching, and work more closely with colleges on business needs. Thus, industry and education have a clear mutuality of interests. Businessmen and educators have not always recognized this. While there are a few businessmen who still regard college professors as vague minded and likely to be radicals, and a few educators who still look on businessmen as mere money grabbers, the mutual distrust has generally disappeared in the mutual need. The rapidly expanding US economy has made college graduates more important than ever to industry In turn, universities must depend increasingly on corporations for contributions, since high taxes have all but cut off the flow of the big individual contributions that built the private school. What are the most important raw materials to businessmen?