题目内容

The principle of drying seawater to salt is ( )

A. Thermal decomposition of seawater
B. increase the temperature and decrease the solubility of sodium chloride in water
C. the solubility of salt increases with the increase of temperature
D. evaporate water by sunlight and wind, and make sodium chloride crystal out

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Cooked food promoted the evolution of prehistoric humans, and grains, fruits and vegetables are used as important sources of diet. Due to the needs of metabolism, the demand of ( ) increased.

A. salt
B. water
C. sugar
D. oil

In the Neolithic age, people invented pottery and tripod, and the following correct order of flavor release is ( )

A. cooked food > raw food
B. roast > boiled
C. Mixed cooking > single cooking
D. cooked food < raw food

Dr. kikuomi Ikeda form Japan extracted 30 g glutamate from ( ), which defined the theory of the earliest flavor components.

A. kelp
B. laminaria
C. fish
D. mutton

Shennong, Emperor Yan of China, once used bark and grass root as medicine

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