讨论一道逻辑题答案

Seajinking

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. People 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.

我觉得正确选项A并不成立，因为在rice and yams引进之后，西非的人还是培养出了主食似乎并不影响以rice and yams来判断最早农业社会的形成啊。我选了B

Seajinking

tophoenix 发表于 2015-10-1 14:22
当然是A了。
我们先看B ，如果非洲有主食的话，也不能削弱，因为，没说他们啥时开始development.
看看A，

A选项是说在rice引进之后，非洲人没有开发出之前停止种植的主食，这个跟能不能用rice来判断部落形成不相关啊，因为是引进“之后”啊

perl

1，首先，最重要的，永远不要质疑官方答案，不要问答案对不对，只问为什么对。
2，个人感觉你对A的理解有点问题：

A选项是说在rice引进之后，非洲人没有开发出之前停止种植的主食，这个跟能不能用rice来判断部落形成不相关啊，因为是引进“之后”啊

我理解的A选项的意思是：非洲人没有开发出主食作物 （ 什么样的主食作物呢） 在引进rice和yam之后就停止种植了的主食作物。所以A的意思就是在引进rice和yam之前，他们没有开发出主食作物。

perl

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

Seajinking

perl 发表于 2015-10-2 23:45
1，首先，最重要的，永远不要质疑官方答案，不要问答案对不对，只问为什么对。
2，个人感觉你对A的理解有点 ...

我就是觉得A选项的说法很奇怪啊
在引进rice和yam之后就停止种植了的“主食作物”，那不还是说其实存在这样的主食作物？或者说这种作物至少是在培养期？

Seajinking

perl 发表于 2015-10-2 23:49
People in western Africa did not develop staple crops (that they stopped cultivating once rice and y ...

B的说法不是更直白一些？能解释一下为什么错么？
P.S.这是GWD的题，我不知道有没有在PREP里出现过，所以答案什么的不好说

perl

Seajinking 发表于 2015-10-3 16:49
我就是觉得A选项的说法很奇怪啊
在引进rice和yam之后就停止种植了的“主食作物”，那不还是说其实存在这 ...

A的意思是不存在这样的作物。

如果存在这样的作物，题干中的推论就不成立了，所以A是assumption。

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

B不成立，因为即使这样的作物存在，但是如果没有被domesticated，那提干中的推论还是成立的。

Seajinking

perl 发表于 2015-10-6 06:41
A的意思是不存在这样的作物。

如果存在这样的作物，题干中的推论就不成立了，所以A是assumption。

好的，懂了，谢谢