Chinese mastered the technology of __________ approximately 5000 years ago. A: iron smelting B: metal smelting C: bronze smelting

Charcoal had been the main fuel of smelting and casting industry before ( ).

Chinese had mastered the technology of smelting bronze approximately 5,000 years ago and iron tools came into use during the ___________.

The _____ controlled the technique of smelting (冶炼) iron for 200 years and made iron weapons to attack its enemy. A: Hittites (赫梯人) B: Assyrians (亚述人) C: Persians (波斯人) D: Phoenicians (腓尼基人)

In the extremely long evolutionary process from the origin of humans, the final impacts and changes of food for the evolution of humans include ( ). A: application of fire make food from raw to cooked B: application of food processing tools make food from coarse to fine C: application of cooking utensils make food from simple to rich D: the emergence of bronzes and the development of smelting technology

In the extremely long evolutionary process from the origin of humans, the final impacts and changes of food for the evolution of humans include ( ). A: A. application of fire make food from raw to cooked B: B. application of food processing tools make food from coarse to fine C: C. application of cooking utensils make food from simple to rich D: D. the emergence of bronzes and the development of smelting technology