[填空题]A great many cities are experiencing difficulties which are nothing new in the history
of cities, except in their scale. Some cities have lost their original purpose and have not
found new one. And any large or rich city is going to attract poor immigrants, who flood 62. ______
in, tilling with hopes of prosperity which are then often disappointing. There are 63. ______
backward towns on the edge of Bombay or Brasilia, just as though there were on the edge 64. ______
of seventeenth-century London or early nineteenth-century Paris. This is new is the scale. 65. ______
Descriptions written by eighteenth-century travelers of the poor of Mexico City, and the 66. ______
enormous contrasts that was to be found there, are very dissimilar to descriptions of 67. ______
Mexico City today--the poor can still be numbered in millions.
The whole monstrous growth rests on economic prosperity, but behind it lies two 68.

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