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标题: [求助] LSAT-4-1-19 [打印本页]

作者: 叮当 时间: 2004-5-1 13:07
标题: [求助] LSAT-4-1-19

请高人指点:

为什么答案是Ｃ？

19. A tree’s age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring’s thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs builders were constrained by tradition to use only logs from trees growing in the sacred laceName>PazyryklaceName> laceType>ValleylaceType>.

Which one of the following, if true, contributes most to an explanation of the archaeologists’ success in using annual rings to establish the relative ages of the tombs at the Pazyryk site?

(A) The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs’ remaining artifacts.

(B) The laceName>PazyryklaceName> laceType>ValleylaceType>, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the laceName>PazyryklaceName> Valley have annual rings that are quite distinct from trees growing in nearby valleys.

(C) Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

(D) The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.（C）

(E) All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.

作者: cranberry 时间: 2004-5-1 13:54
此题以前讨论过，指出一点，题目要求找到年轮指向清晰的年代差别的选项。涉及年轮的，只有BCD。B说的是此木材年轮的特点，却无法确定具体的年代。D说的是木材本身树龄的长短，却也无法确定它们生长的年代。只有C说明，其代表的某些天气状况的特征，可能指向该地某个特定的历史时间。

作者: 叮当 时间: 2004-5-1 14:04

多谢指教. 确认一点, 并非此地树的年轮是以12 RINGS 为一个周期. 我在此搞糊涂啦...

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