题目内容
With the development of human intelligence, it was found in ancient times that （ ） provided certain technical conditions for artificial fire collection
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The use of fire by humans can liberate ( ) from the constraints of the natural environment
In the period of domestication culture, the top three food crops in plants are ( )
The original way of eating wheat is same as other grains, which is called wheat rice.
Wheat represents European civilization, corn is Asia,and rice is Latin America.
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