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18-hour cities combine the best of 24-hour and 9-5 cities, which contributes to downtown revitalization. for decades, many downtown cores in small to mid-sized cities were abandoned after work hours by workers who lived in the suburbs. movement out of city centers was widespread and downtown tenants were predominantly made up of the working poor. this generated little
ommerce for downtown businesses in the evenings, which made business and generating tax renenue for municipal upkeep difficult. with the rise of a new concept in urban planning that aims and more conver increasing popularity for urban areas treal estate pushes in major cities like san francisco or new york, has inspired a type of forward thinking urbanity and in smaller cities
Transforming downtown areas so that they incorporate modern housing and improved walkability to local restaurants, retail and entertainment -especially when combined with improved infra structure for cyclists and public transit-makes them appeal to a more affluent demographic. these adjustments encourage employers in the knowledge and talent industries to keep their offices downtown. access to foot traffic and proximity to transit allow the type of entertainment-oriented businesses such as bars and restaurants to stay open later, which attracts both younger, creative workers and baby boomers nearing retirement alike. because of their smaller size, most keep hours that allow people to enjoy themselves, then have some quiet after midnight, as opposed to large ajor cities like new york, where the buzz of activity is ongoing.
These 18-hour cities are rapidly on the rise and offer great opportunities for ho
investment in many of these cities such as denver, a diverse and vigorous economy attracted to the urban core has offered stable employment for residents. the right urban mix has propped up home occupancy increased property values, and attracted significant investment capital.
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.
52. what can be inferred from the passage about 18-hour cities?
a) they especially appeal to small businesses
b)they have seen a rise in property prices.
c)they have replaced quiet with excitement
d) they have changed america\'s landscape
53 years ago, many downtown cores in small to mid-sized cities().
a)had hardly any business activity
c) exhibited no signs of prosperity
b)were crowded in business hours
d) looked deserted in the evenings
4. 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) housing and improved infrastructure
d) more comfortable life and greater upward mobility.
55. what have 18-hour cities brought to the local residents?
a)more chances for promotion.
c) greater cultural diversity.
b) healthier living environment.
d)Better job opportunities
2017年六级阅读（第二套）
Passage one
Questions 46 to 50 are based on the following passage.
In the beginning of the movie / robot a robot has to decide whom to save after two cars plunge into the water-del spooner or a child. even though spooner screams"save her save her.the robot rescues him because it calculates that he has a 45 percent chance of survival compared to sarah\'s ll percent. the robots decision and its calculated approach raise an important question:would humans make the same choice and which choice would we want our robotic counterparts to make?
Isaac asimov evaded the whole notion of morality in devising his three laws of robotics, which hoId that I. robots cannot harm humans or allow humans to come to harm; 2. robots must obey preservation, unless doing so conflicts with laws i or 2. these laws are programmed into Asimov\'s robots--they don\'t have to think, judge, or value. they don t have to like humans or believe that hurting them is wrong or bad. they simply don\'t do it.

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