泛滥之谜 16-英语听力

[00:00.01]Further up on the highland dome above Lake Tana [00:02.87]The land is similarly dry and barren. [00:05.92]Yet if the Blue Nile is responsible for the great flood [00:10.73]It must surely start somewhere up here. [00:13.97]These mountains might appear lifeless [00:16.86]But look closely and they are alive with rodents. [00:20.86]These moorlands support one of the highest densities of rodents on Earth [00:25.49]Up to three tonnes of them in every square kilometre [00:28.92]Something that has not gone unnoticed by other local residents. [00:33.93]The Ethiopian Wolf, also known as the Red Jackal, is a master rat-catcher. [00:40.17]Normally. [00:41.40]The parched vegetation gives very little cover to the rodents [00:45.23]They have to risk it out in the open [00:48.47]But it's not much good at concealing a wolf either. [00:52.24]The rodents aren't necessarily safe underground. [00:56.06]The wolf has acute hearing, amazingly sensitive smell [01:00.37]And a narrow, stabbing snout full of sharp teeth. [01:04.98]Danger's past, but they must always be on the alert.