Which is the only statement generally agreed on by scientists studying dogs?

　　They originally were used as farm animal

　　They evolved from wolves found in Europe

　　They helped the development of agriculture

　　They were the first animal to be kept as pets

　　Why does the writer first mention the 30,000-year-old animals skulls?

　　To show that dogs were much larger in the past

　　To prove that dogs developed from Asian wolves

　　To suggest that dogs may have evolved much earlier

　　To argue that dogs were first kept in France and Belgium

　　How did scientists determine the origins of the ancient dogs found in Alaska?

　　By examine the animals’ DNA

　　By analyzing the age of their bones

　　By studying the shape of their skulls

　　By comparing them with modern dogs

　　Why did dogs start living with humans?

　　Because they were attracted by food

　　Because they were trapped by humans

　　Because they couldn’t survive in the wild

　　Because they were trained to protect villages

　　答案解析：

　　D. 定位第一自然段“There are a few hard facts that all agree on. These include that dogs were once wolves and they were the first animal to be domesticated(驯养) by humans”可知选项D正确。

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