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  3. Milk was one of the main human foods long before history was written. It will probably remain one as long as there are animals t

Milk was one of the main human foods long before history was written. It will probably remain one as long as there are animals t

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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 has been found. It was drawn five thousand years ago.
   In the years long ago, people got their milk from their own animals. But in modem times new inventions made the milk industry a big business. In 1851 Gall Borden found a way to take some of the water out from milk. This made milk keep longer. Four years later, Louis Pasteur introduced a way to kill the bacteria in milk. Next, a special milk bottle was made. This was followed by the invention of machines that could fill bottles with milk.
   These discoveries had a great effect on the milk industry. They meant that milk could be stored longer.
   Some people believe that milk drinking will become less popular than it 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.
People did a lot of work to make milk ______.
选项 A、more tasty
B、easy to drink
C、easy to store
D、thicker
答案C
解析 由文章第三段可以看出，牛奶工艺的每一步改进都使得牛奶可以储存的更久。这与选项C的内容一致。
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