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According to the theory of single origin of human beings, the main reason that drives human beings to have to migrate on a large scale (worldwide) is（）.

A. looking for living food
B. coping with climate change
C. insufficient regional resources
D. ethnic territory struggle

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From the origin of human beings to the very long evolutionary process, the most important thing that food ultimately influenced and changed human evolution is ( )

A. with the application of fire, food changes from raw to cooked
B. application of food processing tools, from coarse to fine
C. cooking utensils from simple to rich
D. the emergence of bronzes and the development of smelting technology

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Since the spring and autumn period and the warring states period, the most important measures to guarantee the population growth of the Chinese nation several times are ( ).

A. the introduction and large-scale planting of wheat in the Qin and Han Dynasties
B. the introduction and large area planting of corn, sweet potato and potato in Ming and Qing Dynasties
C. advances in farming and multiple cropping techniques, improvement in irrigation capacity and improvement in yield per unit area of new varieties
D. the substantially increasing yield per unit area of the new variety and technical support chemical fertilizers and pesticides

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There is an invisible hand behind food, which promotes the evolution of human beings, the construction of society, the victory and defeat of wars, the rise and fall of empires, the gain and loss of territories, the collision of civilizations, the exchange of cultures, the development of science and technology, etc., which is mainly reflected in ( ) and other aspects.

A. status, power and wealth
B. trade, access and taxation
C. war, territory and empire
D. knowledge system, scientific culture, religious customs and progress of civilization

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At present, ( ) is the most important species in the domestication and breeding of plants and animals that the ancestors of the Chinese nation have influenced and contributed the most to the survival and social development of human beings.

A. rice and millet
B. cattle and sheep
C. pigs and chickens
D. camels and dog

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According to the theory of single origin of human beings, the main reason that drives human beings to have to migrate on a large scale (worldwide) is（ ）.

A. looking for living food B. coping with climate change C. insufficient regional resources D. ethnic territory struggle

From the origin of human beings to the very long evolutionary process, the most important thing that food ultimately influenced and changed human evolution is ( )

Since the spring and autumn period and the warring states period, the most important measures to guarantee the population growth of the Chinese nation several times are ( ).

At present, ( ) is the most important species in the domestication and breeding of plants and animals that the ancestors of the Chinese nation have influenced and contributed the most to the survival and social development of human beings.

According to the theory of single origin of human beings, the main reason that drives human beings to have to migrate on a large scale (worldwide) is（）.

A. looking for living food
B. coping with climate change
C. insufficient regional resources
D. ethnic territory struggle