請依下文回答第 31 題至 35 題The economic conditions that necessitate the construction of very high buildings on narrow lots first emergedas a decisive factor in New York City. Intensive land use, with the resulting speculative traffic in real estate,was itself a consequence of more powerful and pervasive forces. Industrial expansion was the primary factor,and in the period following the American Civil War much of that expansion continued to be concentrated inNew England and the Middle Atlantic states. Financial institutions had long been located mainly in Boston,but the center was rapidly shifting to New York around the time of the War. A new pattern of closeinterdependence among industries demanded centralization of business administration. The leadership of NewYork City as an ocean port, along with its proximity to major arteries of land transportation, was a local factorthat helped to make the city an irresistible magnet. Its power to attract, once established, has never waned;even today it is a primary administrative and banking center. The financial resources for the high building werethere; the development of safe elevator transportation and the organization of construction facilities soon madethem a reality.
【題組】31 Which of the following would be the best title for the passage?
(A) Buying Real Estate for Speculation in New England
(B) The Development of New York City as a Business Center
(C) New Patterns of Transportation in the Middle Atlantic States
(D) The Building Construction Industry during the American Civil War