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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