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Which animal do we need   ? Dogs? Horses? No! The   to the question is cows. Why cows? Cows give us milk. And milk is one of our most important   of food.
Suppose(假设)that all the milk cows make in one year were put    bottles. And suppose these bottles were put side by side. The line of bottles would go all around the world 400    That is a lot of milk, less than half of it is used for  and cooking. Most of it is  to make butter cheese, ice cream and many other things. It takes many cows to give us ___ much milk. But not as many as it used to. A cow used to give only about 1,500 quarts(夸脱)of milk a year. Now a fine cow may   more than 3,000 quarts in a year.
Why do cows give more milk today? Now farmers have better cows. The cows get better  and better food.