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Archaeologists seeking the location of a legendary siege and destruction of a city are excavating in several possible places, including a middle and a lower layer of a large mound. The bottom of the middle layer contains some pieces of pottery of type 3, known to be from a later period than the time of the destruction of the city, but the lower layer does not.
The force of the evidence cited above is most seriously weakened if which of the following is true?
(A) Gerbils, small animals long native to the area, dig large burrows into which objects can fall when the burrows collapse.
(B) Pottery of types 1 and 2, found in the lower level, was used in the cities from which, according to the legend, the besieging forces came.
(C) Several pieces of stone from a lower-layer wall have been found incorporated into the remains of a building in the middle layer.
(D) Both the middle and the lower layer show evidence of large-scale destruction of habitations by fire.
(E) Bronze axheads of a type used at the time of the siege were found in the lower level of excavation.
前提：middle layer has Type-3, known to be from a later period than the time of the destruction of the city.
结论：middle layer doesn't present the city.
Weaken: Type-3 doesn't belong to the middle layer. 选：A. 东西是后面掉入的。则，middle layer still present that city.
B: Support lower layer presenting the city, 与原讨论无关
C: 讨论stone, 没有指明stone代表什么， 无关
D： the same as C
E: only about the lower layer, doesn't mean anything about middle layer, 无关
Understand now? good luck!!!作者: StephanieYun 时间: 2003-7-4 15:14
well done!
解释应该清楚了
niagara, 你的名字好奇怪啊，什么意思呢
生活是一杯清茶作者: balticsea 时间: 2003-7-4 16:05
再次请教，这个结论是怎么看出来的？
谢谢！
我的逻辑真是糟糕
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