1, milk is one of the oldest natural beverages, known as "white blood", the importance of the human body can be imagined. Milk, as the name suggests, is milked from female cows. In different countries, there are different grades of milk.

2. The most common types of milk are whole milk, low-fat milk and skimmed milk. There are also a lot of additives to milk on the market today, such as high-calcium low-fat milk, which has added calcium.