Reading Comprehension 
从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。
     In downtown Detroit there is a concert hall called the Ford Auditorium, a reminder that Detroit owes its rapid growth and one-time prosperity to the automobile, and above all to Henry Ford.
      Henry Ford did not invent the automobile, but he was the first man to mass-produce it, thus making it available to the ordinary man. Automobiles were built by hand at the turn of the last century and were much too expensive for all but the wealthy. In 1903, Henry Ford''s first mass-produced Model T cars cost $850. By the early 1920s, he was able to reduce the price to $350. Between 1903 and 1927, Ford manufactured 15 million Model T Fords and earned a profit of $700 million. In 1927, he produced his sedan Model A, which was much more comfortable than the open, windswept Model T. 

     Henry Ford was himself a born mechanic and could build a car all by himself.He respected his workers and treated them well. In 1914, when the basic wage for an industrial worker in Detroit was $11 a week, Ford announced that he would pay his workers $5 a day. Ford believed in the dignity(尊严) of work, and did not want his men to become underpaid robots. He also built for them a special town on the suburbs of the city.
     Ford's wage policy of $5 a day caused not only a wage explosion in the city as well as a population explosion. Blacks from the South poured into the city, and there were almost as many blacks in Detroit as whites. Other industries connected with the automobile were attracted to Detroit, and more and more factories sprang up in and around the city. Other automobile corporations also made Detroit their headquarters. General Motors an amalgamation(融合,合并)of Chevrolet, Cadillac, Oldsmobile and Buick, built factories in Detroit as did Chrysler. In the 1960s, one in three who lived in Detroit worked in the automobile industry.