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. What is the main reason of the reduction of the grizzly bears’ number

A．Lacking food.
B．Forest deceasing.
C．The coyote existing.
D．Not clear yet.

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单项选择题

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. What is the main reason of the reduction of the grizzly bears’ number 您的浏览器不支持 audio 元素。