根据短文内容回答下列问题

根据短文内容回答下列问题
Milk was one of the main human foods long before history was written .It will probably remain one as long as there are animals that give milk.
The old word"milk"came from Sanskrit,one of the oldest languages known to man.A very old picture of milking animalshas been found.It was drawn five thousand years ago .People got their milk from their own animals.But in modern times new inventions made the milk industry a big business.In 1851 Gall Borden found a way to take some of the water from milk .This made it keep longer.Four years later,Louis Pasteur introduced a way to kill the bacteria in milk.So in the same year a speial milk bottle was made.This was followd by the invention of machines that could fill bottles with milk.
These discoveries meant that milk could be stored longer.
Some people belive that milk drinking will become less popular than ie has been.But remember how long milk has been an important food and think of the many ways in which it is useful.It seems safe to say that milk industry will always be important.
1.When did people began to get milk from animals?
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2.What kind of languages is Sanskrit?
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3.Why did people kill the bacteria in milk?
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4.When was the special milk bottle made?
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5.Is the milk one of the most important foods?
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