48. The general principles of making cheese from milk have changed little for nearly 3000 years.________.The first step is to add acid or enzyme to the milk. Next, the liquid, called whey, is drained, leaving a semi-solid cheese, called curds. All soft or cream cheeses are of this type. Hard cheese undergoes two additional steps in the process. The semi-solid cheese is matured, salted and pressed into forms or moulds. The final step is the aging process during which the world's most famous cheeses acquire their unique flavors from the place and length of storage.(A) All the methods are slightly changed.(B) Making cheese is not an easy task at all.(C) The process consists of two to four basic steps.(D) The principles are followed in different cultures.