(2) 1. About 700,000 to 200,000 years ago, Beijingers who ate hair and drank blood already knew how to use natural fire. Cavemen who lived 30,000 years ago mastered the technology of artificial fire. They used fire to barbecue food, thus changing the situation of eating hair and drinking blood.
In winter, they live in caves, but in summer, they live in caves. Hemudu people who lived 7,000 years ago have built wooden houses with dry columns, and Banpo people who lived 5,000 to 6,000 years ago have built houses with minarets and half caves, thus changing the situation of "living in caves in winter and living in caves in summer".
3. Without hemp, a bone needle was unearthed in the Neanderthal site 30,000 years ago, which proved that people at that time could sew the skins of animals together and cover them; The earliest textile tools in the world unearthed in Hemudu 6000 years ago and the spinning wheel unearthed in Banpo site 5000-6000 years ago all proved that people at that time could spin, thus changing the situation of "clothes covered with feathers and no hemp".