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閱讀下列短文, 從所給的四個選項中, 選出最佳答案。 (Look at Fig.1 and Fig. 2 while doing your work.)

    Fig. 1. Rural-urban shift　　 Fig. 2. Urbanization in developed　　　　 　　in the USA 1800-2000　　　　 and developing countries　　 　　Since 1900, the United States' population percentage (比例) of　　 RURAL and URBAN areas changed a lot.

    As more and more people left the rural areas, the urban population　　 started to increase rapidly.

    The trend (趨勢) towards urbanization is worldwide. It can also be　　 found in developing countries. From 1930 to 1950, the RURAL-URBAN　　 SHIFT (moving from one place to another) in both developed and　　 developing countries was almost the same. But since the 1970's, the　　 situation has been quite different.

 (1) At the beginning of the 19th century, the urban population of 

the United States was _________.　　　　　　　　　　　　  ［　　］ 　　   

  A. 5 million, more than 90 percent of the total population 　　  

  B. 5 million, less than 90 percent of the total population 　　  

  C. 300 thousand, more than 10 percent of the total population 　　  

  D. 300 thousand, less than 10 percent of the total population　　    

(2)  By the year 2000, it is estimated (估計) that the rural 

population of the United States will be _________.    ［　　］  　　   

　　   A. 250 million 　　   
　　   B. 5 million 　　   
　　   C. more than 90% of the total population 　　   
　　   D. only 10% of the total population