gre考试阅读真题解析(A)_GRE阅读

　　21. Which of the following would serve as an example of concomitant structural features that might disadvantage a snail of the rarer form?

　　 A shell and body that are an exact mirror image of a snail of the commoner form

　　 A smaller population of the snails of the rarer form

　　 A chip or fracture in the shell caused by an object falling on it

　　 A pattern on the shell that better camouflages it

　　 A smaller shell opening that restricts mobility and ingestion relative to that of a snail of the commoner form

　　22. The second paragraph of the passage is primarily concerned with offering possible reasons why

　　 it is unlikely that evolutionary mechanisms could discriminate against sinistral snails

　　 sinistrality is relatively uncommon among snail species

　　 dextral and sinistral populations of a snail species tend to intermingle

　　 a theory based on a developmental mechanism inadequately accounts for the predominance of dextrality across snail species

　　 dextral snails breed more readily than sinistral snails, even within predominantly sinistral populations

　　23. In describing the evolutionary mechanism , the author mentions which of the following?

　　 The favorable conditions for nurturing new offspring

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