PREP 逻辑求助

fzynshl

求助各位大神，这道题为什么选B？all是不是有绝对化的嫌疑？

C为什么不对呢？

Archaeologists in Michigan have excavated a Native American camp near Dumaw Creek. Radiocarbon dating of animal bones found at the site indicates that the camp dates from some time between 1605 and 1755. However, the camp probably dates to no later than 1630, since no European trade goods were found at the site, and European traders were active in the region from the 1620's onward.

Which of the following, if true, most strengthens the argument?

• ADue to trade among Native Americans, some European trade goods would have reached the area before the European traders themselves did.  分析A选项
• BAt all camps in the region that have been reliably dated to the late 1620's, remains of European trade goods have been found.  分析B选项
• CThe first European trade goods to reach the area would have been considered especially valuable and preserved as much as possible from loss or destruction.  分析C选项
• DThe first European traders in the area followed soon after the first European explorers.  分析D选项
• EThe site is that of a temporary camp that would have been used seasonally for a few years and then abandoned.  分析E选项
  

killGMATonce

表达一下个人拙见：
P： no European trade goods were found at the site, and European traders were active in the region from the 1620's onward
C：the camp probably dates to no later than 1630
要求strengthen结论：
B：在这个地区所有那些被确定在1620年以后的camps，都发现了 remains of European trade goods
     其实是一个排除他因的思路，all在这里不仅没有绝对化的嫌疑，反而是非常必要的存在。
C：仔细读这个选项发现跟结论并没有太大关系啊：The first European trade goods to reach the area 是 especially valuable and preserved from loss or destruction，既然保存很好为什么在前提的site中没有发现呢？
以上~

fzynshl

我的想法是欧洲的东西是很珍贵的，所以如果在1630以后的话，就一定会有一些欧洲的东西被保存下来，但是现在没有发现欧洲的东西，所以这是一种加强。。。

fzynshl

killGMATonce 发表于 2016-9-8 11:52
表达一下个人拙见：
P： no European trade goods were found at the site, and European traders were act ...

我的想法是欧洲的东西是很珍贵的，所以如果在1630以后的话，就一定会有一些欧洲的东西被保存下来，但是现在没有发现欧洲的东西，所以这是一种加强。。。

killGMATonce

感觉楼主说的似乎不是C选项想表达的意思。。。

VincentFSJ

条件里没有说道1620吧？好像c也有点加强的意思（但是我自己假设了，既然保存的好不会被loss或者destructure，那怎么会被发现在这个site呢？），但是没有解释1620’s onward是怎么来的呀

咖啡印象

题目假设的关键是：    欧洲货的出现和欧洲人出现有必然联系

(B) At all camps in the region that have been reliably dated to the late 1620's, remains of European trade goods have been found. 1620年之后的就都发现欧洲人的东西，强烈对比，说明没有发现的就是没有欧洲人的年代。肯定了题目假设

(C) The first European trade goods to reach the area would have been considered especially valuable and preserved as much as possible from loss or destruction. 并没有排除就没有保存下来的可能，而且没有说明是否欧洲货出现和欧洲人出现的时间有必然联系，也有可能是native自己倒卖过来的