prep2-120 代词指代

feir2004

以下是引用minirainbow在2008-10-23 1:40:00的发言：
觉得16楼讲解的挺好，挺受启发，只是我觉得“in some contemporary turtle species ”作
 状语修饰谓语 “function as”有点不妥，我觉得“in some contemporary turtle species ”应该是介词短语修饰主语themoderately sharp and jagged edges of         horny jaws ，如果将答案A改为：

in some contemporary turtle species themoderately sharp and jagged edges of their horny jaws functionas teeth.   答案A就是正确的。

我有点疑惑「the moderately sharp and jagged edges of the …..  」
究竟是做什么成份？

    提点个人看法，我觉得prep的A选项的解释是错误的 -- their 没有用错，只是function for 错了。
   jaws 显然不是 although 后面“the turtle”的 jaws ，而是 some  contemporary turtle species 的jaws 。
  后半句应该理顺了说应该是 the moderately sharp and jagged edges of  _ jaws founction as teeth in some contemporary turtle species .
 主语是“the moderately sharp and jagged edges of  _ jaws ” ，谓语是 “function as”，宾语是“teeth” ，后面的“in some contemporary turtle species ”作
 状语修饰谓语 “function as”
从这个角度看，jaws 用their 和 its 都不合适，因为其指代对象在后面，所以用 the 最合适。

-- by 会员 solon (2009/6/7 17:34:00)

Guido2010

It is much easier if you understand what the sentence is saying before you make corrections.  

Statements:
1.  turtle has been toothless for millions of years
2.  certain SPECIES (of turtle) have edges that act as teeth.

This should automatically eliminate B and C. Because the subject of the second part is SPECIES.

The second part of the test is idiomatic expressions.  X functions as Y is the correct idiom.  Thus the answer should be E.

24lam

前面并没有提及jaws，为什么要用定冠词the来表示特指？

enkyklios

难道大家没有发现their 不能指代介词后边的名词吗？所以这里无论its还是their都不对

zl9848

理解语义也很重要，下面是老外的一个评论：Between D&E, D changes the meaning to say that the jaws perform the same functions as teeth do (the jaws chew), whereas E retains the original meaning that the jaws act as teeth -> so E