Milk was one of the main foods for people long before history was written. Maybe (21) will remain an important food as long as there are (22) that give milk. The old word "milk" (23) Sanskrit(梵文), one of the oldest (24) known to man. A very old picture of milking, (25) was drawn five thousand years ago, has been found. In the years long ago, people got their milk (26) their own animals. But (27) modern times new inventions made the milk industry(产业) a big business. (28) 1851 Gall Borden found a way to (29) some of the water out from milk. This made milk keep longer. Four years later, Louis Pasteur (30) a way to kill the bacteria(细菌) in milk. Then a special milk bottle was made. This was followed (31) the invention of machines that could fill bottles with milk. The discoveries had a great effect(影响) on the milk industry. They meant that milk could be kept longer. Some people believe that milk drinking will become less popular (32) it has been. But remember how long milk has been an important food (33) think of the many ways (34) it is useful. It seems (35) to say that the milk industry will always be important.26（） A.to  B.about  C.from  D.into