【正确答案】The lecture offers two physical features that aid some animals in attaining a high speed while running. For both of these features, the cheetah, a large wildcat of Africa, is cited.
The first feature has something to do with the animal's tough feet. Clearly, an animal subject to foot pain cannot be expected to run well in the wild. The cheetah's foot pads are compared to leather by the lecture. These are, it is pointed out, useful in running across the hot sands and rocks of its grassland/desert environment.
The other characteristic mentioned is the cheetah's long hind legs. Since these are longer than the front legs, the animal is able to begin its runs with a leap and hit the ground at full stride. Both of these factors contribute to the cheetah's being able to run at a speed of up to 120 km/h.

【答案解析】 该讲座描述了动物高速奔跑时的两个身体特征。直接找出核心内容，在文章的第一段中：This portion of the lecture will focus on two of these．