51. What do we learn about American cities twenty years ago?
- A. They were divided into residential and business areas.
- B. Their housing prices were linked with their prosperity.
- C. There was a clear divide between large and small cities.
- D. They were places where large investment capital flowed.
答案：C
答案句：Twenty years ago, the Urban Land Institute defined the two types of cities that dominated the US landscape: smaller cities that operated around standard 9-5 business hours and large metropolitan areas that ran all 24 hours of the day.
参考译文：二十年前，城市土地研究所定义了两类主导美国版图的城市：围绕标准朝九晚五营业时间运作的小城市，以及全天24小时运转的大都市区。
定位线索：题干“American cities twenty years ago”→答案句取自第1段“Twenty years ago”；文中“two types of cities”对应选项“a clear divide”；文中“smaller cities...large metropolitan areas”对应选项“large and small cities”。
解析：题干问二十年前美国城市的情况，答案句直接说明当时存在两类城市：小城市和大都市区，即存在明确划分，对应C选项。A选项“居住区和商业区”无中生有；B选项“房价与繁荣相关”文中未提及；D选项“投资资本流动”是后文分析内容，答非所问。
53. Years ago, many downtown cores in small to mid-sized cities.
- A. had hardly any business activity
- B. were crowded in business hours
- C. exhibited no signs of prosperity
- D. looked deserted in the evenings
答案：D
答案句：For decades, many downtown cores in small to mid-sized cities were abandoned after work hours by workers who lived in the suburbs.
参考译文：几十年来，许多中小城市的市中心在上班时间过后，被住在郊区的工人遗弃。
定位线索：题干“Years ago, many downtown cores”→答案句取自第3段“For decades, many downtown cores”；文中“abandoned after work hours”对应选项“looked deserted in the evenings”。
解析：题干问多年前中小城市市中心的情况，答案句说下班后被遗弃，即晚上空无一人，对应D选项。A选项“几乎没有商业活动”范围过大，文中只说晚上商业少；B选项“上班时间拥挤”文中未提及；C选项“没有繁荣迹象”过于绝对。
54. What characterizes the new downtown areas in 18-hour cities?
- A. A sudden emergence of the knowledge industry.
- B. Flooding in of large crowds of migrant workers.
- C. Modernized housing and improved infrastructure.
- D. More comfortable life and greater upward mobility.
答案：C
答案句：Transforming downtown areas so that they incorporate modern housing and improved walkability to local restaurants, retail, and entertainment-especially when combined with improved infrastructure for cyclists and public transit-makes them appeal to a more affluent demographic.
参考译文：改造市中心区域，使其包含现代住房和改善的步行可达性，通往当地餐馆、零售店和娱乐场所——尤其是与改善的自行车和公共交通基础设施相结合——使它们吸引更富裕的人群。
定位线索：题干“new downtown areas in 18-hour cities”→答案句取自第4段“Transforming downtown areas”；文中“modern housing”和“improved infrastructure”对应选项“Modernized housing and improved infrastructure”。
解析：题干问18小时城市新市中心的特点，答案句明确提到“modern housing”和“improved infrastructure”，对应C选项。A选项“知识产业突然出现”文中只说鼓励雇主留在市中心，非突然出现；B选项“大量农民工涌入”无中生有；D选项“更大向上流动性”文中未提及。
55. What have 18-hour cities brought to the local residents?
- A. More chances for promotion.
- B. Healthier living environment.
- C. Greater cultural diversity.
- D. Better job opportunities.
答案：D
答案句：In many of these cities such as Denver, a diverse and vigorous economy attracted to the urban core has offered stable employment for residents.
参考译文：在这些城市中的许多城市，如丹佛，一个多元而充满活力的经济被吸引到城市核心，为居民提供了稳定的就业。
定位线索：题干“18-hour cities brought to the local residents”→答案句取自末段“In many of these cities”；文中“offered stable employment”对应选项“Better job opportunities”。
解析：题干问18小时城市给当地居民带来了什么，答案句说“offered stable employment”，即提供稳定就业，对应D选项。A选项“晋升机会”文中未提及；B选项“更健康的生活环境”无中生有；C选项“文化多样性”文中未提及。