Geologists have found that streams in the Karoo basin of South Africa changed suddenly at the end of the Permian period 250 million years ago, from the meandering shape typically found in well-vegetated zones to the braided pattern found in areas without deep-rooted vegetation to hold the soil together.


from the meandering shape typically found in well-vegetated zones to the braided pattern found in areas without deep-rooted vegetation to hold

from the meandering shape typically found in well-vegetated zones to the braided pattern that they find in areas without deep-rooted vegetation for holding

from the meandering shape typical in well-vegetated zones to the braided pattern found in areas where it is without deep-rooted vegetation for holding

shifting from the meandering shape typically found in well-vegetated zones to the braided pattern found in areas where it is without deep-rooted vegetation for holding

shifting from the meandering shape that is typical in well-vegetated zones to the braided pattern being found in areas without deep-rooted vegetation to hold

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题目分析：
略

选项分析：

A选项：Correct. 本选项在语法和逻辑上均是正确的。

B选项：the braided pattern的定语从句 that they find in areas中的复数代词they没有指代对象。其在字面上可以指代句首的geologists，但在逻辑上，发现the braided pattern于那些没有植被覆盖的地方的应该是农民，其它的科学家等等的各种人，不是（或不仅是）这些地理学家。另外，介词短语for holding the soil together需改为不定式短语to hold the soil together。这点考查了不定式和ing的区别，用之于本题，显然地，“没有深根植被的覆盖”对“将土壤抓在一起”的发生与否有直接的影响。

C选项：代词it没有指代对象；介词短语for holding the soil together错误同选项(B)。

D选项：本选项错误同(C)。

E选项：分词短语being found表示同时性。但在本题中，found事件和shift from A to B事件不具备同时发生的关系。因此，being应该去掉。

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Prep2012-SC
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