What does the passage mainly discuss? According to the passage, why do ants use different compounds as trail pheromones?

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问题 What does the passage mainly discuss?
According to the passage, why do ants use different compounds as trail pheromones?

选项 A、To reduce their sensitivity to some chemicals
B、To attract different types of ants
C、To protect their trail from other species
D、To indicate how far away the food is

答案C

解析

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托福（TOEFL）

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【S1】【S3】

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What does the passage mainly discuss? According to the passage, why do ants use different compounds as trail pheromones?

托福（TOEFL）

AccordingtoEvansandLevinson,apparentsimilaritiesbetweenlanguagescouldbedueto

ClassifythefollowinginformationasreferringtoAadoptedthewritingsystemfromanothercountryBusedorganicmaterialst

HowdesertsareformedA.Adesertreferstoabarrensectionofland,mainlyinaridandsemi-aridareas,wherethereisal

SECTION3Questions21-30Questions21Whichthreeguestsareontheradioprogramme?Writethecorrectletteronyouranswer

TheConstructionEducationCentrehasexistedfor______.Equipmentisavailablefor______days.

Whatdidthewomanfinddifficultaboutthedifferentresearchtechniquessheused?ChooseFIVEanswersfromtheboxandwritet

TheSpanish(claiming)titleto(allof)NorthAmericaandestablishedthe(oldestcity)intheUnitedStates,St.Augustine,Flo

In1913(when)he(was)only18(yearold),LeoSowerby’sviolinconcertowas(performedby)theChicagoSymphony.

THEEFFECTSOFSLEEPDEPRIVATION1Sleeprestoresthebodyandthemindandhelpspreventdiseasebystrengtheningtheimmune

某5岁外来儿童出现了肌张力减弱、肌力下降、腱反射减弱或消失等症状，属于急性弛缓性麻痹病例(AFP)，其监测目的不包括()

患者，女，50岁。频繁呕吐5天，不能进食，出现脱水、低血钾，补液时家属心切，私自将补液速度加快，发生了高血钾。此时治疗应选用

A、初熔时的温度至全熔时的温度B、供试品在毛细管内开始局部液化出现明显液滴时的温度C、供试品在毛细管内全部液化时的温度D、平氏黏度计E、旋转式黏度计熔点的测定（ ）。

石灰硬化是经过()完成的。

下列财务评价指标中，反应项目盈利能力的指标是()。[2014年真题]

衡量国债规模的绝对量指标有()。

短期平均成本曲线呈U形的原因与()。

TheinferencewecandrawfromwhatacontemporaryofShaw’sisthat______.WhichofthefollowingstatementsisNOTcorrect?

A、It’sanotherwaytoloseweight.B、It’sverycheap.C、It’snotsocrowded.D、It’snearby.D女士说娱乐中心离她的住处很近，故选D。

【S1】【S3】

TheConstructionEducationCentrehasexistedfor.Equipmentisavailablefordays.

A、初熔时的温度至全熔时的温度B、供试品在毛细管内开始局部液化出现明显液滴时的温度C、供试品在毛细管内全部液化时的温度D、平氏黏度计E、旋转式黏度计熔点的测定（　　）。