Turtles, like other reptiles, can endure long fasts, in their ability to survive on weekly or even monthly feedings; however, when food is readily available, they may eat frequently and grow very fat.


fasts, in their ability to survive

fasts, having their ability to survive

fasts, due to having the ability of surviving

fasts because they are able to survive

fasts because of having the ability of surviving

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考题讲解

题目分析：
略。

选项分析：

A选项：in their ability to survive不能表达本题中两个小句的因果关系，即，“乌龟可以忍受长时间的禁食”和“他们有能力在每周或每月一次喂食的条件下生存”之间应该具有因果关系。

B选项：having their ability to survive是伴随状语，可以表达两个小句间的因果关系，但是，本选项会引发赘余的情况。由于伴随状语的逻辑主语和其主句主语相同，所以本选项中的伴随状语在逻辑上为：
Turtles have their ability to survive on weekly or even monthly feedings.
显然地，their是赘余的。乌龟肯定是拥有自己的能力，不可能还拥有“别人”的能力。因此应该写为：
having the ability to survive

C选项：ability身后需要用to do而不能用of doing。这点考查了“不定式和ing的区别”。用之于本题，当我们说，一个有能力干什么的时候，这件事的发生与否必然和我们拥有的能力有直接关系，若我们没有能力，这件事就不会发生。因此，ability身后的定语需要用不定式的形式。

D选项：Correct. 本选项在语法和逻辑上均是正确的。

E选项：ability身后需要用to do而不能用of doing错误同(C)。


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