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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在事业单位管理中，受聘人员如果连续旷工()，聘用单位可以随时单方面解除合同。

男，65岁。进行性黄疸3个月，伴中上腹持续性胀痛，夜间平卧时加重，消瘦10kg。查体：慢性面容，皮肤、巩膜黄染，腹平坦，脐右上方深压痛，未及包块，Colarvoisier征阳性。最可能的诊断是

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