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
查看答案
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
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
It is generally believed that the most important golden age that ever occurred in the history of human civilization was ( ).
A. from 5000 BC to 3000 BC, ancient Egypt (Nile valley), ancient Babylon (Mesopotamia), ancient India (Indus river, Ganges river Basin) and China (Yellow River and Yangtze river Basin) were later called "four ancient civilizations".
B. from 800 BC to 200 BC, the eastern and western philosophical systems and social and cultural systems were formed, also known as the axial age.
C. the Roman Empire in the west and the Tang and Song Dynasties in the east
D. from the 14th century to the beginning of the 17th century, the European ideological liberation movement lasted for about 300 years, namely the European Renaissance.
By 2018, China has been carrying out reform and opening-up for 40 years. In terms of national food security and food industry development, China has experienced three steps: "sufficient food supply to solve the problem of satiety", "ensuring food abundance to solve the problem of satiety" and "ensuring food convenient operation and maintenance safety", which is also compared to ( )
A. food safety assurance project
B. dining table engineering
C. rice bag project
D. vegetable basket project