每周一聽——那些年我們一起練過的聽力（第171期）

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每周一聽——那些年我們一起練過的聽力（第171期）

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Why is it that when dogs drink, water seems to go everywhere?
When my dog drinks from her    (1)    , there is no question, water will end up on the floor. It looks like a    (2)    , unorganized way to get a good drink of water.
  Researchers at Virginia Tech University have been studying how dogs drink. They say dogs know exactly what they are doing. The animals are actually making precise movements at a high speed. This helps them get the   (3)    they need when they are thirsty.
  It turns out that neither dogs, nor cats, have a full set of    (4)    . This means they cannot create   (5)      to drink, like humans or elephants and horses.
  Dogs lap, or take up, the water with their tongues    (6)      backward. As they lap, they move their tongues very quickly to build up    (7)    . That forces the water into a column and up into their mouths.
   The Virginia Tech researchers    (8)    19 dogs of different sizes and   (9)      as they drank water. They created different laboratory models to measure tongue motion, and the amounts of water taken in.
   Using the data from these experiments, the researchers were able to make a model that shows how a dog drinks water.
   The researchers said that since the mouths of dogs and cats are   (10)      nearly the same way, they thought they would drink water the same way, too.
   But here is a surprise. The studies showed each family of animals has its own special drinking method.
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