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5 10 15 20	The changing profile of a city in the United States is apparent in the shiftingdefinitions used by the United States Bureau of the Census. In 1870 the censusofficially distinguished the nation's “urban” from its “rural” population for the first Line time. “Urban population” was defined as persons living in towns of 8,000 inhabitantsor more. But after 1900 it meant persons living in incorporated places having 2,500 ormore inhabitants.      Then, in 1950 the Census Bureau radically changed its definition of “urban” to takeaccount of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived inunincorporated units of that size, and also all persons living in the densely settled urbanfringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).      Each SMSA would contain at least (a) one central city with 50,000 inhabitants ormore or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.      While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use : “metropolitan regions”, “polynucleated population groups”, “conurbations”, “metropolitan clusters”, “megalopolises”, and so on.
39. What does the passage mainly discuss? (A) How cities in the United States began and developed (B) Solutions to overcrowding in cities (C) The changing definition of an urban area (D) How the United States Census Bureau conducts a census 40. According to the passage, the population of the United States was first classified as rural or urban in (A) 1870 (B) 1900 (C) 1950 (D) 1970 41. The word “distinguished”in line 3 is closest in meaning to (A) differentiated    (B) removed (C) honored   (D) protected 42. Prior to 1900, how many inhabitants would a town have to have before being defined as urban? (A) 2,500 (B) 8,000 (C) 15,000 (D) 50,000 43. According to the passage, why did the Census Bureau revise the definition of urban in 1950? (A) City borders had become less distinct. (B) Cities had undergone radical social change. (C) Elected officials could not agree on an acceptable definition. (D) New businesses had relocated to larger cities. 44. The word “those”in line 9 refers to (A) boundaries (B) persons (C) units (D) areas 45. The word “constituting” in line 16 is closest in meaning to (A) located near (B) determined by (C) calling for (D) making up 46. The word “which ” in line 18 refers to a smaller (A) population (B) city (C) character (D) figure 47. Which of the following is NOT true of an SMSA? (A) It has a population of at least 50,000 (B) It can include a city's outlying regions. (C) It can include unincorporated regions. (D) It consists of at least two cities. 48. By 1970, what proportion of the population in the United States did NOT live in an SMSA? (A) 3/4 (B) 2/3 (C) 1/2 (D) 1/3 49. The Census Bureau first used the term “SMSA” in (A) 1900 (B) 1950 (C) 1969 (D) 1970 50. Where in the passage does the author mention names used by social scientists for an urban area? (A) Lines 4-5 (B) Line 7-8 (C) Line 21-23 (D) Line 27-29
39. C 40. A 41. A 42. B 43. A 44. B 45. D 46. B 47. D 48. D 49. B 50. D