旧prep-46题--困惑求指导~~~！！！

Thymeling

46.        (33987-!-item-!-188;#058&007200)

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

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

(A) Due to tradeamong Native Americans, some European trade goods would have reached the areabefore the European traders themselves did.
(B) At all camps inthe region that have been reliably dated to the late 1620's, remains ofEuropean trade goods have been found.
(C) The firstEuropean trade goods to reach the area would have been considered especiallyvaluable and preserved as much as possible from loss or destruction.
(D) The firstEuropean traders in the area followed soon after the first European explorers.
(E) The site is thatof a temporary camp that would have been used seasonally for a few years andthen abandoned.

我很困惑C为什么错。C说最先到达此地区的物品都被保存地很好，那么就排除了文章的一个漏洞啊。。。因为如果20年代有European trade goods到了此地，却被毁掉了，这样就是 "no European trade goods were found at the site“的一个漏洞了，没发现不是因为不存在而是被毁掉了。  
看了很多帖子都说C是无关项，可是加强题本身就可以存在无关概念啊。只要能增大结论成立的概率就行了。
求解求解求解~~~~~~~~~~~~~~~~~~

jj1400

原文可以简化为：没有欧洲贸易，所以在１６３０之前。
Ａ：无关/削弱。如果成立，那么说明并不是1620年开始的贸易能决定遗址的，因为之前还可能有货物。但是其实是无关选项
B:1620年之后的都发现了，更能说明这东西应该不晚于1630
C：文中是通过欧洲贸易的时间来推断这个遗址的时间，跟value等没关系

Thymeling

原文可以简化为：没有欧洲贸易，所以在１６３０之前。
Ａ：无关/削弱。如果成立，那么说明并不是1620年开始的贸易能决定遗址的，因为之前还可能有货物。但是其实是无关选项
B:1620年之后的都发现了，更能说明这东西应该不晚于1630
C：文中是通过欧洲贸易的时间来推断这个遗址的时间，跟value等没关系

-- by 会员 jj1400 (2013/2/15 12:40:41)

难道说，C项重点是要表达valuable，不管后半句是否有道理，它都是无关要排除？