单项选择题

Questions 17～20 are based on the following passage. You now have 20 seconds to read questions 17～20. According to the passage, what were dogs trained for in the past

A．For protection against other animals.
B．For protection against other dogs.
C．Just for fun.
D．For the purpose of guarding the house.

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单项选择题

单项选择题

Questions 17～20 are based on the following passage. You now have 20 seconds to read questions 17～20. According to the passage, what were dogs trained for in the past 您的浏览器不支持 audio 元素。