prep1-essay 15

想请教prep1中的一道阅读：

Essay #15.  341    (23562-!-item-!-188;#058&00341-00)

Dendrochronology, the study of tree-ring records to glean information about the past, is possible because each year a tree adds a new layer of wood between the existing wood and the bark.  In temperate and subpolar climates, cells added at the growing season's start are large and thin-walled, but later the new cells that develop are smaller and thick-walled; the growing season is followed by a period of dormancy.  When a tree trunk is viewed in cross section, a boundary line is normally visible between the small-celled wood added at the end of the growing season in the previous year and the large-celled spring wood of the following year's growing season.  The annual growth pattern appears as a series of larger and larger rings.  In wet years rings are broad; during drought years they are narrow, since the trees grow less.  Often, ring patterns of dead trees of different, but
            overlapping,
            ages can be correlated to provide an extended index of past climate conditions.

However, trees that grew in areas with a steady supply of groundwater show little variation in ring width from year to year; these "complacent" rings tell nothing about changes in climate.  And trees in extremely dry regions may go a year or two without adding any rings, thereby introducing uncertainties into the count.  Certain species  sometimes add more than one ring in a single year, when growth halts temporarily and then starts again.

Question #50.  341-02  (23608-!-item-!-188;#058&000341-02)

The passage suggests which of the following about the ring patterns of two trees that grew in the same area and that were of different, but overlapping, ages?

(A) The rings corresponding to the overlapping years would often exhibit similar patterns.

(B) The rings corresponding to the years in which only one of the trees was alive would not reliably indicate the climate conditions of those years.

(C) The rings corresponding to the overlapping years would exhibit similar patterns only if the trees were of the same species.

(D) The rings corresponding to the overlapping years could not be complacent rings.

(E) The rings corresponding to the overlapping years would provide a more reliable index of dry climate conditions than of wet conditions.

答案为A

如果按内容定位，是否是highlight的这一句呢？可是由此如何推出exhibit similar patterns？Tks in advance!

其实为什么这里讨论prep的人这么少呢？大家好像都只关注GWD。。。

我觉得prep里的阅读虽然题目比较简单，但文章大多比GWD里的难，而且有深度，又符合ETS的思路，不是更应该多研究吗？

Often, ring patterns of dead trees of different, but
     overlapping,
      ages can be correlated to provide an extended index of past climate conditions：

既然说可以provide,那就表示两个因该有联系啦，支持选A，反正可以排除B，C，D，E。不过，原文看的有点迷糊

(A) The rings corresponding to the overlapping years would often exhibit similar patterns.

看清选项了,  是overlapping years(重叠年份) 的 ring 地相同的.

因为ring 只受外部环境的影响, 而与age 无关, 所以A 对.