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标题: GWD19-40，答案好像反了。 [打印本页]
作者: zljadress    时间: 2009-5-1 22:34
标题: GWD19-40，答案好像反了。

Agricultural
societies cannot exist without staple crops. 
Several food plants, such as kola and okra, are known to have been
domesticated in western Africa, but they are
all supplemental, not staple, foods.  All
the recorded staple crops grown in western Africa
were introduced from elsewhere, beginning, at some unknown date, with rice and
yams.  Therefore, discovering when rice
and yams were introduced into western Africa
would establish the earliest date at which agricultural societies could have
arisen there.


    

 


    

Which of the
following is an assumption on which the argument depends?


    

 


    

            
  1. People in western Africa
         did not develop staple crops that they stopped cultivating once rice and yams
         were introduced.

    2.         
  2. There are no plants native to western Africa that, if domesticated, could serve as staple
         food crops.

    3.         
  3. Rice and yams were grown as staple
         crops by the earliest agricultural societies outside of western Africa.

    4.         
  4. Kola and okra are better suited to
         growing conditions in western Africa than
         domesticated rice and yams are.

    5.         
  5. Kola and okra were domesticated in
         western Africa before rice and yams were
         introduced there.

    6.     

       答案选A，是不是弄反了？
作者: lollypp    时间: 2009-5-2 08:33
没反是对的啊，在 rice and yams were introduced之前，他们did not develop staple crops。根据题目说Agricultural societies cannot exist without staple crops，这里的假设即是rice and yams是staple crops，这样才能根据他们引进的时间来确定农业社会开始的时间。



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