21-英语听力

[00:03.73]The Tibetan brown bear [00:05.91]a close relative of the grizzly [00:08.20]tries to dig the pikas out of their burrows [00:12.59]Even hard-frozen soil presents little obstacle to a determined bear [00:26.94]The wily Tibetan fox is quick to spot any opportunity [00:57.39]True to form, the crafty fox claims the prize [01:11.33]A combination of inaccessibility, and ancient traditions which forbid hunting, means that in some parts of the plateau, wild animals have remained relatively undisturbed, even today. [01:24.95]But in those areas which are within reach of motor vehicles [01:28.45]these historical safeguards have been undermined [01:33.87]This change is illustrated in the fortunes of the chiru [01:38.18]A century ago, millions migrated across the plateau [01:43.15]Unfortunately for the chiru, its fur known as "shahtoosh" or "king of wools" is highly prized [01:51.07]In recent decades poachers have been able to venture deep into the wilderness killing thousands of chiru