450)=450"> 本文选自雅思听力Section 4，难度较大 Summary:本文是关于澳大利亚原住民的石刻画的专题报告。当地石刻画的发展经历了Dynamic, Yam和Modern三个时期。每一时期的特点都很明显，且与当地居民的生活习惯、周围环境以及历史发展阶段有紧密关系。最后提到，现代科学家正在探索许多画作中的抽象形象是源于何种生物。 HINTS Dynamic Yam Aborigines Rainbow Serpent 全文听写，英式拼法 订阅节目更方便
For example, we know from the Dynamic paintings that over 8,000 years ago, Aborigines would have rarely eaten fish and sea levels were much lower at this time. In fact, fish didn't start to appear in paintings until the Yam period along with shells and other marine images. The paintings of the Yam tradition also suggest that, during this time, the Aborigines moved away from animals as their main food source and began including vegetables in their diet, as these feature prominently. Freshwater creatures didn't appear in the paintings until the Modern period from 4,000 years ago. So, these paintings have already taught us a lot. But one image that has always intrigued us is known as the "Rainbow Serpent". The Rainbow Serpent, which is the focus of my most recent project, gets its name from its snake or serpent-like body and it first appeared in the Yam period four to 6,000 years ago. Many believe it is a curious mixture of kangaroo, snake and crocodile. But we decided to study the Rainbow Serpent paintings to see if we could locate the animal that the very first painters based their image on.