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）

Answerthequestionsbelow.ChooseNOMORETHANTHREEWORDSAND/ORANUMBERfromthepassageforeachanswer.Writeyouranswers

CompletethesummarybelowusingthelistofwordsA-lbelow.WritethecorrectletterA-linboxes38-40onyouranswersheet.

Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.Keepta

Lookatthefollowingopinions(Questions20-23)andthelistofpeoplebelow.Matcheachopiniontothepersoncreditedwithit.

EducationPhilosophyA.Althoughwelackaccuratestatisticsaboutchildmortalityinthepre-industrialperiod,wedohave

Arborealnestsoftenfeaturecarton______constructedbytermites.Subterraneannestsarecommonwherethereare______ofmo

Whenisthedeadlineforhandingindissertations?WhatwillthestudentsprobablyspendthesecondhalfofAprildoing?

WhichTHREEthingsdoesCesarrecommendbringing?AbinocularsBcameraCpenknifeDmapEraincoatFmobilephone

A、HishouseswereoftensmallB、HisdesignswereoverlysimpleC、HisroofsoftenleakedD、Hisbuildingdidnotmatchtheirnatur

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公共建筑及综合性建筑,总高度超过()的为高层,但不包括总高度超过这个范围的单层建筑。

承包单位对施工合同实施偏差进行分析，其内容包括：产生合同偏差的原因分析，合同实施偏差的责任分析及()。

权利人对他人所有的不动产或者动产，依法享有占有、使用和收益的权利是()。

国务院期货监督管理机构依法履行职责,可以采取的措施有()。

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