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

ReadthetextbelowandanswerQuestions15-21.FORMALDRESSCODEFORCOMPANYEMPLOYEESAtTransitEuropean,thecomp

Peoplewhochallengetheevidenceofclimatechangehavegenerally

WhatdoesNickEvanssayaboutspeakersofacreole?

Thefirststagesintheactualrestorationwillinvolvedelicatesurfacecleaning,usingasmallvacuumsuctiondevice.Oncethe

AccordingtoMrSingh,onwhichthingdomanypeoplemakesuperficialobservations?MrSinghbelievesthatthebestwaytobes

HowmanyLondonundergroundlinesarethere?Inwhichtwowaysarethelinesdistinguishedfromeachother?

Whichgroupgavethefollowingadvice?TickColumnAifitwasmainlywomen.TickColumnBifitwasmainlymen.TickColumnCi

Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.Ifyouneedtofindinformationonacertainbook

Manyscientistsbelieve______asaresultofacollisionbetweenthenewlyformedEarthandalargeasteroid.

行政法律关系由（）要素构成。

对骨折病人进行现场急救时，下列最好的次序是【】

企业总体战略的基本类型有哪些?

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汇票未按规定期限提示承兑的，下列说法正确的是(　　)。