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.
Gre填空词汇:有序跟无序
Gre词汇词根词缀:ad-/amphi-记忆方法
新gre考试:填空题对词汇的考察2
gre词汇:熬夜的表达方式
GRE动词同义词总结30
Gre填空词汇:攻击跟防守
Gre填空词汇:冲突
GRE 动词同义词总结18
Gre填空词汇:表扬跟讽刺
GRE 动词同义词总结16
Gre填空词汇:美德跟缺点
GRE 动词同义词总结22
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Gre填空词汇:相同对差异
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新gre考试:阅读题对词汇的考察(下)
gre词汇:请假的表达方式
Gre词汇词根词缀:be-/bi-系列记忆方法
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Gre六选二近义词词汇总结92
GRE 动词同义词总结23
GRE 动词同义词总结24
GRE 动词同义词总结5
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