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.Theeco

Youshouldspendabout20minutesonQuestions14-26whicharebasedonReadingPassage2below.CoastalArchaeologyofBritain

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ChooseTHREEletters,A-F.Writethecorrectlettersinboxesonyouranswersheet.Thelistbelowincludescharacteristics

Thievesoftentargetstudents’homesbecausestudents______.Theinsurancecompanyhasa24______.

WhatdidPhoebefinddifficultaboutthedifferentresearchtechniquessheused?ChooseFIVEanswersfromtheboxandwritethe

Choosethecorrectletter,A,BorC.WhatdifficultydoesJillhavewiththeenergymeters?

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THEEFFECTSOFSLEEPDEPRIVATION1Sleeprestoresthebodyandthemindandhelpspreventdiseasebystrengtheningtheimmune

刘某，女，24岁，因失恋而服毒，已昏迷，送往医院抢救，但不知道她所服的药物，护士应采取的护理措施是

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