求助 救救这个孩子吧 prep1-cr46. (33987-!-item-!-188;#058&007200)

heart0120

Q16 p1-cr46.(33987-!-item-!-188;#058&007200)



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?



(A) Due to trade among Native Americans, some European trade goods would have reached the area before the European traders themselves did.

(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.

(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.

(D) The first European traders in the area followed soon after the first European explorers.

(E) The site is that of a temporary camp that would have been used seasonally for a few years and then abandoned.

答案是B  题干说因为没发现trade goods，推出，camp不晚于1630，B选项说1620年以后发现trade goods  怎么感觉挺矛盾呢。。。
哎，这题不太懂，谁给讲讲？小女子这厢有礼了！！！

sdcar2010

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.

In logic terms: If [camp later than late 1620's], then [European goods found].
The countrapositive: If [European goods are NOT found], then [camp are NOT later than late 1620's].

Therefore, (B) supports the claim that the camp probably dates to no later than 1630 [the same as LATE 1620's].

lonelyorchid

题目可能觉的十八世纪二十年代晚期和1930年是一个概念。也就是说是同一个时间点。
题目说，没有的话就是在那时间之前。
B说之后的都有，所以自然是加强

carolfeng

personally, A: no trade goods.B:earler than1630
the answer is no B  no A

hldada

文中论断：没有欧洲货品被发现，则这个camp 早于1630。
逆否命题：如果camp晚于1630，则必定有欧洲货品存在。

B是原论断的逆否命题，绝对most strengthens

小驴子michelle

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.

In logic terms: If [camp later than late 1620's], then [European goods found].
The countrapositive: If [European goods are NOT found], then [camp are NOT later than late 1620's].

Therefore, (B) supports the claim that the camp probably dates to no later than 1630 [the same as LATE 1620's].

-- by 会员 sdcar2010 (2011/1/7 22:07:14)

分析的太到位了