Nowadays many people like to have dogs as their pets. Dogs are friends of man not only because they are lovely but also because they are faithful to their masters.
Dogs can do a lot of work for man. They play with us. They hunt with us. They keep door for us. But long ago, dogs all over the world were wild.
Dogs can date back to the Stone Age. All dogs have the same ancestor. It is believed that their ancestor was much like a wolf. Other animals, such as the fox, came from this ancestor, too. Hundreds of thousands of years ago, man began to tame wild dogs. After the dogs were tamed, they were trained. The strong dogs became working animals. They were trained to pull heavy loads. They learned to keep an eye on the sheep and other animals. Working dogs had other jobs, too.
Some dogs were not strong. But they could help man hunt for game. Other dogs were best as pets.
Today, there are more than 100 kinds of dogs in the world.
美国习惯用语-第192讲:Hat in hand
美国习惯用语-第180讲:Brain drain
美国习惯用语-第168讲:Whistle in the dark
美国习惯用语-第151讲:Easy street/Out on the&n
美国习惯用语-第169讲:Nothing special
美国习惯用语-第141讲:all skin and bones
美国习惯用语-第155讲:Tight-lipped/Tight with someo
美国习惯用语-第157讲:OUT OF ONE´S SKULL/S
美国习惯用语-第142讲:to skin someone alive/sk
美国习惯用语-第123讲:belly laugh/knee-slapper
美国习惯用语-第165讲:Over a barrel/ Over 
美国习惯用语-第159讲:Lick/Lickety split
美国习惯用语-第138讲:no skin off my nose
美国习惯用语-第122讲:the last straw/to sow&nb
美国习惯用语-第156讲:LOOSE LIPS/AT LOOSE ENDS
美国习惯用语-第162讲:To get it in the&nb
美国习惯用语-第179讲:to beat one´s brains
美国习惯用语-第194讲Fat cat
美国习惯用语-第178讲:jump the gun
美国习惯用语-第193讲:Fat farm
美国习惯用语-第189讲:stand tall
美国习惯用语-第153讲:To knock off
美国习惯用语-第173讲:to keep one´s cool
美国习惯用语-第143讲:one of a kind/top-notch
美国习惯用语-第161讲:Up to one´s neck
美国习惯用语-第147讲:green thumb/all thumbs
美国习惯用语-第140讲:spinning one´s wheel
美国习惯用语-第145讲:set of wheels/free-wheeler
美国习惯用语-第171讲:To whistle a different&n
美国习惯用语-第166讲:Out of the woods/Out&nbs
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