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）

Completethenotesbelow.ChooseNOMORETHANTWOWORDSfromthepassageforeachanswer.Howcoral-reef-basedresou

Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.AAmericanstodaychooseamong

Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.SourceofKnowledgeAWhatcou

HowdesertsareformedA.Adesertreferstoabarrensectionofland,mainlyinaridandsemi-aridareas,wherethereisal

Thievesoftentargetstudents’homesbecausestudents______.Theinsurancecompanyhasa24______.

TheConstructionEducationCentrehasexistedfor______.Howmanyschemeswereshownatthe"SustainableLondon"event?

Completethechartbelow.Matchtheadvantagesofjoiningalearningcircle(I-VI)totheperson.NOTE:therearemorea

Choosethecorrectletter,A,BorC.WhatdifficultydoesJillhavewiththeenergymeters?

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FightinginNatureInnature,fightingissuchanever-presentprocessthatitsbehaviormechanismsandweaponsarehighlyd

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A、河车大造丸B、大补阴丸C、薯蓣丸D、玉泉丸E、左归丸某男，50岁。数月来，虚劳咳嗽，骨蒸潮热，盗汗遗精，腰膝酸软。证属肺肾两亏，宜选用的成药是

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