What does the passage mainly discuss? According to the passage, how are ants guided by trail pheromones?

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问题 What does the passage mainly discuss?
According to the passage, how are ants guided by trail pheromones?

选项 A、They concentrate on the smell of food.
B、They follow an ant who is familiar with the trail
C、They avoid the vapor spaces by moving in a straight line.
D、They sense the vapor through their antennae.

答案D

解析

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托福（TOEFL）

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What does the passage mainly discuss? According to the passage, how are ants guided by trail pheromones?

托福（TOEFL）

Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.SportS

Completethesummarybelow.ChooseNOMORETHANTHREEWORDSfromthepassageforeachanswe,Thenatureofm

ReadingPassage2hassevenparagraphs,A-G.Whichparagraphcontainsthefollowinginformation?Writethecorrectletter,A-G

WhichthreeforeignlanguagesaretraditionallytaughtintheUSA?Theyhave(He/Shehas)beenlearningChinesesincetheywere

WhichthreeforeignlanguagesaretraditionallytaughtintheUSA?HowoldaretheyoungestschoolchildrenlearningChinese?

Thievesoftentargetstudents’homesbecausestudents______.Theinsurancecompanyhasa24______.

Theprofessorsaysthatsuperhighways______.【30】

EngineeringforsustainabledevelopmentTheGreenhouseProject(Himalayanmountainregion)ProblemShortgrowingseason

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

A．矢状线B．冠状线C．正中线D．水平线E．垂直线与人体矢状面平行的水平线

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下面谱例中领唱与合唱的关系是()。

记忆是个被动保持信息的系统。()

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Thievesoftentargetstudents’homesbecausestudents.Theinsurancecompanyhasa24.