What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

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问题 What does the passage mainly discuss?
The purpose of the second mention of "hormones" in line 4 is to point out

选项 A、chemical signals that are common among insects
B、specific responses of various species to chemical signals
C、similarities between two chemical substances
D、how insects produce different chemical substances

答案C

解析

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托福（TOEFL）

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What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

托福（TOEFL）

Completethesummarybelow.ChooseNOMORETHANTWOWORDSfromthepassageforeachanswer.Writeyouranswersinboxes22-26on

LostforWordsManyminoritylanguagesareonthedangerlistIntheNativeAmericanNavajonation,whichsprawlsacross

TheDevelopmentofMuseumsATheconvictionthathistoricalrelicsprovideinfallibletestimony

WilliamGilbertandMagnetismA16thand17thcenturiessawtwogreatpioneersofmodernscience:GalileoandGilbert.Theimpac

NewZealandSeaweedCallusnotweeds;weareflowersofthesea.SectionASeaweedisaparticularlynutritiousfood,whichabs

TheHistoryoftheGuitarTheword’guitar’wasbroughtintoEnglishasanadaptationoftheSpanishword’guitarra,’whichwas,

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POLITICALSYSTEMSOFTHETWENTIETHCENTURY1Monarchyisaformofgovernmentinwhichauthorityisheldbyasingleperson,a

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