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In China, the first standard to measure food quality is ( )
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In the early Paleolithic Age, because of the low population density, primitive humans can enjoy enough resources. So the three ways of food sources are ( )
In the Paleolithic Age, the discovery and use of fire is a very important achievement for primitive people. They learned to use fire through a long process from natural fire to artificial fire. Please rank the development of fire （ ）
With the development of human intelligence, it was found in ancient times that （ ） provided certain technical conditions for artificial fire collection
The use of fire by humans can liberate ( ) from the constraints of the natural environment
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