GWD-9-40

happycg

ddddddddddddddd

powerful

这里的once是指before吗？

january_ye

顶

夜凉如水

recorded staple crops 与 staple crops 之间有 GAP

Zspirit

以下是引用sammaijgd在2005-9-9 20:01:00的发言：

做题的时候，读完就知道答案应该排除他因型，开始从选项选，看了Ａ半天也没选，简单的意思，非得用复杂的句意来表达，无语了

同意，自己在做的时候已经想到assumption的关键是在时间点上，而且肯定是排除rice和yam引进前存在staple plant的可能性，但A的那个that从句死活没读懂，就没选。。。
现在想想，AB中确实只有A明确的提到了时间点，而且看了前辈的翻译，发现A中的that从句只是为了更严谨的表达，虽然这个更严谨的表达并不能比People in western Africa did not develop staple crops before the introduction of rice and yams这样一个简单的句型提供更多的实质的信息。

yifeir

多谢诸位讨论，明白了。

flowerfish

这道题目我原始选择的是B，但是当时觉得A也可以，有点犹豫，看了这里的评论知道还是A的assumption更有说服力，这是一个defender题目。

SuccessMBA08

以下是引用lawyer_1在2004-8-19 19:34:00的发言：
B 取非为There are some plants native to western Africa that, if domesticated, could serve as staple food crops

因为即使这样，你不知这些PLANTS domesticated是在rice and yams were introduced into western Africa 之前还是之后，如果之后，则结论仍能成立。即B取非不一定使结论不成立。而A取非是结论一定不成立

清楚，明白了！！

Mars861227

那位请帮忙解释一下：
我的结论是：不管A是去掉not都是削弱
A的意思是，一旦R和Y被引入后，西非的人们就不会发展他们已经停止耕种的主要农作物。
就是在R和Y引入之前，他们已经有了staple crop，只不过引入后不再继续耕种了，但是以前却有啊。这削弱了结论，怎么能作为earlist days的前提呢？

如果A改成：ffice:smarttags">
    

A.     
People in western Africa never developed staple crops until rice and yams
were introduced. 那才是正确的

谢谢帮忙

    ffice:smarttags">
    

河西学校

xiexie

GWD-9-Q40:

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

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

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

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

 

题目结论：

有
        稳定的农物种
        才有
        农业社会，

西非
        稳定的农物种是R,Y，因此搞清楚R,Y引进的日期，就可以知道西非农业社会开始的最早日期。

注意：关键词：staple crops
            是判断agricultural societies是否存在的依据，因此选项里要围绕这两个关键词来谈。

 

A，当引进R,Y的时候，西非人没有停止种植一些稳定的农作物。取非后，如果引进R,Y的时候，西非人停止种植了一些稳定的农作物，说明西非以前就有农业社会，这样就削弱了原来的结论。

B，非常迷惑的选项，当地没有可以用来种植的本土原生的农作物。取非，不能削弱原来的结论。

C，西非以外的社会，其他社会无关；

D，乱比；

E，无关信息；