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 zoos to such practices. However, some zoo 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 " Opponents of white-tiger breeding programs" mentioned in the highlighted text advocate that zoos use their resources to
promote public awareness of environmental threats to tiger habitats
allow zoos to house enough tigers to ensure genetic diversity among Indian tigers
study ways to increase the survival rates of white tigers in the wild
investigate ways of maintaining the white tigers already in zoos
preserve tiger subspecies that may be endangered
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正确答案是E. 保护濒危的老虎亚种。从文中可以看到,反对白老虎繁殖计划的对手主张对于白老虎不应进行繁殖,因为它们只是印度老虎亚种,在野外和动物园中都很常见,因此,动物园应当专注于保护濒危的老虎亚种,以防止中国和印度洋老虎亚种加入爪哇、巴厘岛和里海老虎亚种走向灭绝。
没有提到研究和调查方法渠道等,而是E中的保护濒危动物,endangered不是灭绝了的,而是面临灭绝危险的