Related Information (2) Stone Age Stone Age: the earliest prehistoric period, when only stohe was used for making tools, weapon, etc. In the text the author refer to the backward and primitive life of people in such a period t 石器代 Text A of Unit 9 By Yang XiangfangText A of Unit 9 By Yang Xiongfang II. Related Information : (2) Stone Age: Stone Age: the earliest prehistoric period, when only stone was used for making tools, weapon ,etc. In the text the author refers to the backward and primitive life of people in such a period