【正确答案】topic During the lecture, the professor refers to two characteristics that animals from mountain area must have. (Based on the lecture, mountain areas are dangerous for living creatures, because they are steep, rocky, and snowy. Thus, mountain animals have formed two characteristics in order to adapt to such severe environment.) example 1 The first characteristic is that animals must have a strong muscle structure. For example, mountain goats have a unique and strong muscle structure in order to help them climb and jump without falling down when they look for food in mountain areas where a lot of snow covered rocky cliffs. example 2 Then professor refers to another characteristic, the special feet. For example, Bighorn sheep have developed hoofs with special pads and sharp edges, thus they can stand firmly and form skidding on the rocks when they are moving on slippers cliffs.

【答案解析】[听力原文] W: Mountains are as beautiful as they are deadly. The innumerous dangers, if not taken seriously can either kill us or cause us to be badly injured. These dangers include steep inclines, ice, snow, and bone chilling winds. However, some species of animals can live on mountain ranges because they have developed and formed two features, allowing them to survive in the harsh mountain environment over thousands of years. A strong muscle structure is one significant feature of species like Mountain goats. They have developed to adapt to the mountain environment over time. A strong muscular system enables them to climb at seemingly impossible angles and jump nimbly from ledge to ledge when they are searching or foraging food in mountain areas. As we all know, mountain roads or rocks are extremely steep and slippery with snow, making animals easily to fail. Therefore, special feet are another important feature that species dwelling in the area acquire. The Bighorn sheep have become well adapted to living on slippery and rocky cliffs. Their hoofs or feet have special pads with hard sharp edges surrounding a soft inner area which provide the animals with extra traction thus preventing them from skidding on the rocks. Therefore, the Bighorn sheep can get a better grip while climbing.