彭蒙惠英语(简装光盘版)2018年11月期-彭蒙惠英语杂志封面、内容精彩试读
   
彭蒙惠英语(简装光盘版)2018年11月期

彭蒙惠英语(简装光盘版)2018年11月期

The current reality
Wolves, which made their way to Isle Royale over an ice bridge from the mainland in the 1940s, once numbered as high as 50. But inbreeding, disease and a freak accident have knocked their numbers back to the single pair that roam the island today Warmer winters have also produced fewer ice bridges in recent years, reducing the odds of new wolves wandering In......



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