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.
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
反对者认为白虎仅仅是Indian tigers，而动物园应该将老虎保护放在那些生存遭到威胁的subspecies。-> indian tigers的生存没有遭到威胁
However, these cantons often shared other characteristics—similar linguistic backgrounds and strong leftist parties—that may help to explain this phenomenon.
Many scholars have theorized that economic development, particularly industrialization and urbanization, contributes to the growth of participatory democracy
A，语意冗余
B，研究关于他的书，不对，可以说研究关于从他的书里总结出来的某个观点，书就是研究对象，直接时research one's book
C，research into James Baldwin's books written while in France=research into James Baldwin's books and the books are written while in France,被动式不带by的都没有逻辑主语，没讲清楚是谁写的（JB的书不代表就是JB写的书，也可以理解成是JB买的、拥有的书）
D，on错误，written同样没主语
E，the books James Baldwin wrote while he lived in France，JB住在法国时写的书，语意清晰
the behavior of sloth bear cubs, which on their mother's back at the first sign of danger, suggests that predation was a key stimulus.
cubs在看到危险以后就会爬到妈妈的背上去
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A错在哪里啦？D: 第二黑是支持提供"反对(contention)"理由的证据，所以是反对一黑
E: 第二黑支持第一黑（The first is a "position"...; the second is evidence to support "that position"）