单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, yon will be given 15 seconds to answer the questions.
Now listen to the passage.
According to the speaker, why did wolves attack humans

A．They had no other food.
B．They had lost their homes.
C．They naturally hunted all creatures.
D．To protect their young.

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, yon will be given 15 seconds to answer the questions. Now listen to the passage. According to the speaker, why did wolves attack humans 您的浏览器不支持 audio 元素。