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?

托福（TOEFL）

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REVIEWOFRESEARCHONTHEEFFECTSOFFOODPROMOTIONTOCHILDRENThisreviewwascommissionedbytheFoodStandardsAgencytoex

Timekeeper:InventionofMarineChronometerA.Uptothemiddleofthe18thcentury,thenavigatorswerestillunabletoexa

CompletethenotesbelowWriteONEWORDONLYforeachanswer.TheGherkinBuildingCommissionedby:【L31】______firmcalledFoste

(luxury)food(source)本题有关兔子引入英国的用途。录音原文中的introducedto“引入”是题目中importedinto“进口到”的同义表述：录音原文用because从句替换了题目中的不定式词组tobeusedfor，

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