请问GWD9-40,西非种植主要作物的题,实在是搜索不到一个确切的答案

ambrosia2010

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?



A.    eople in western Africa did not develop staple crops that they stopped cultivating once rice and yams were introduced.
B.    There are no plants native to western Africa that, if domesticated, could serve as staple food crops.
C.    Rice and yams were grown as staple crops by the earliest agricultural societies outside of western Africa.
D.    Kola and okra are better suited to growing conditions in western Africa than domesticated rice and yams are.
E.     Kola and okra were domesticated in western Africa before rice and yams were introduced there.

我这份GWD的答案是A，我自己也选的A，但其实我做题的时候没看懂，是乱选的。在论坛上搜索解释发现此题讨论的很少，而且还有个说法是选B。这下我更糊涂了，请同学们赐教！（最好能翻译下A选项，读起来觉得读不懂呢>.<)

感谢感谢！

ambrosia2010

.....是这道题太简单了吗？都没有人回复的...T_T

我觉得我是被绕进去了

gwinyu

题目说有主要作物才有农业社会。西非本身的作物都是辅助作物，所有主要作物都是从其他地方传入的。结论：知道了rice，yam的传入时间就知道农业社会最早是啥时候兴起的。

A是说rice和yam是最初传入西非的主要作物

B说西非本身没有主要作物

很明显选A，可以取非验证。