Questions 15～19
Seoul, once city for kings, can now claim to be a city for commuters. The third nation in the Orient to develop an underground rapid-transit system, Korea opened its first line in 1974. After 12 years of continuing construction, Seoul had finally completed the rest of its extensive subway system, capable of serving 5 million commuters a day.
The 73-mile-long system, the world's seventh largest, is expected to alleviate the acute daily traffic congestion downtown.
For an estimated $ 2.7 billion, the city has built one of the most modem subways in the world, replete with air-conditioning, high-tech ticket machines and escalators to deep-level stations. The subway stops, bucking an international tradition of dull concrete walls, are attractions themselves: many ate lined with shopping arcades, others sponsor art exhibits and several have been blasted out of granite and left in their natural state, creating an eerie, cave like effect.
The subway is a long-term solution to transit problems in a city that is bursting at the seams with 9.5 million people. It is designed to encourage the growth of satellite cities along the lines that run outside the city proper. Efficiency, safety and economy are the catchwords of the Seoul Metropolitan Subway Corporation, which handled construction and now manages the four lines. But traditional concern for cleanliness adds to the popularity of this rapid mode of underground transportation.
Recently 20 young couples chose the subway as the site for their wedding ceremonies, proof that the system is heralding a new age of modem living for the inhabitants of the nation's capital.
15. According to the passage, how many cities in the world have subway systems larger than that in Seoul, Korea?
    A. None.                                  B. Three.
    C. Six                                    D.

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