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Questions 17—20 are based on the following talk given by a zoologist. You now have 20 seconds to read Questions 17—20. How do the speaker and his assistants trace the grizzly bear

A．By tracing them.
B．By using computer system.
C．By using computer technology.
D．By studying science papers.

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单项选择题

Questions 17—20 are based on the following talk given by a zoologist. You now have 20 seconds to read Questions 17—20. How do the speaker and his assistants trace the grizzly bear 您的浏览器不支持 audio 元素。