5. Around 4,000 years ago, in an important step of their socioeconomic evolution, human beings, with
their increasing needs in nutrition and in food choices, started to breed animals and process their milk.
That’s when cheese was born. We say “born” because cheese cannot really be said to have been
“invented.” It must have resulted from the simple observation that milk left in a container ends up
changing to a solid state. ________________
(A) This is how human beings create cheese in the very beginning.
(B) To sum up, cheese has become a prevalent food in western countries.
(C) Therefore, people have underestimated the importance of cheese to our life.
(D) This might be considered the first technological cheese-making discovery.