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[GMAT阅读题讨论] PREP2012阅读第11篇第1题

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icetong123 发表于 2015-1-9 15:31:47 | 显示全部楼层 |阅读模式
White tigers are neither a species nor a subspecies, but appear as a result of a recessive trait
that rarely occurs in the wild. In the 1950s many zoos deliberately and indiscriminately bred
white tigers, but more recently, concerns about the desirability of preserving a trait that
presumably hinders tigers‘ to survive in the wild, and recognition that inbreeding
could lead to genetic defects, have caused most 2005 to such practices. However, some 200
managers argue that the popularity of white tigers provides income important to the survival
of zoo sponsored scientific and conservation programs. They also point out that most of the
white tigers captured in the wild were adults, proving that their coloration does not hinder
their survival ability.
Opponents of white-tiger breeding programs argue that white tigers are merely Indian
tigers—a subspecies well represented in both zoos and the wild—and that zoos should focus
their tiger management efforts on preserving subspecies whose existence is threatened, thus
preventing the Chinese and Indochinese tiger subspecies from joining the Javan, Balinese,
and Caspian subspecies in extinction. Alternatively, zoos could mingle the subspecies and
manage all tigers in captivity as one species. Although subspecies differences would be lost,
this strategy would be advantageous because fewer animals would be necessary to maintain
the genetic diversity of tigers in captivity, making scarce zoo resources available for housing
other endangered felines.
The passage suggests that, compared with other tiger subspecies, the Indian tiger is
A. less threatened by extinction
B. less readily bred in captivity less
C. likely to survive in the wild
D. more likely to be bred indiscriminately
E. more popular with 200 visitors


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