题目选项分析

No longer do many cities in the United States have a river as the focal point of urban life, but in San Antonio the river winds through the middle of the business district, and the River Walk, or Paseo del Rio, is the city's most popular attraction.

Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio winds through the middle of the business district, and the River Walk, or Paseo del Rio, is the city's most popular attraction.