What does the passage mainly discuss? Why are otters and mussel shells included in the discussion in paragraph 3?

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问题 What does the passage mainly discuss?
Why are otters and mussel shells included in the discussion in paragraph 3?

选项 A、To provide an example of tool use among animals
B、To prove that certain species demonstrate greater ability in tool use than other species
C、The information can not be found by all means
D、None of the above

答案A

解析

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托福（TOEFL）

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What does the passage mainly discuss? Why are otters and mussel shells included in the discussion in paragraph 3?

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A．黄连、生姜B．细辛、肉桂C．黄芩、黄柏D．人参、干姜半夏泻心汤组成中含有的药物是

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