OG详解-OG2 文法 Q28

Choice A is the best answer. The sentence emphasizes the distance covered by the Philadelphia and Lancaster Turnpike, noting that the turnpike, which connected the two Pennsylvania cities in its name, was sixty-two miles long. 
Choice B is incorrect. The sentence emphasizes the significance of the turnpike; it doesn’t emphasize the distance that the turnpike covered. Choice C is incorrect. While the sentence mentions that the turnpike connected two Pennsylvania cities, it doesn’t emphasize the specific distance covered by the turnpike. Choice D is incorrect. The sentence emphasizes when the turnpike was built; it doesn’t emphasize the distance that the turnpike covered