托福听力tpo67 lecture1、2、3 原文+题目+答案+译文.docx

托福听力tpo67lecture1、2、3原文+题目+答案+译文

TOC\o1-2\h\u85Lecture1 2

31727原文 2

27019题目 4

5418答案 6

13285译文 6

13854Lecture2 7

2724原文 7

22578题目 10

14355答案 12

257译文 12

26102Lecture3 13

19332原文 14

8837题目 16

30643答案 18

22023译文 18

Lecture1

原文

Professor:Nowwevesaidthatanimalbehaviorpatternsinvolveaninterplaybetweenananimalanditsenvironment.Inparticular,behaviorpatternscanchangeasananimalbecomesadaptedtoitsenvironment.Wecanseetheresultsofthisinthewaythatanimalshavedevelopeddifferenttypesoffeedingbehavior.Animalsaregenerallyclassifiedasageneralistfeedersandspecialistfeeders.Now,um,thesetermsareusedinavarietyofways.Attimes,theyreusedtorefertoananimalsrangeofhabitats.Ivealsoseenthemusedtodescribethenumberofforagingtechniquesthatareusedbyanindividualorspecies.

Um,butforourpurposes,weregoingtousethemtorefertotherangeoffooditemsthatareeatenbyaspecies.Soageneralistfeederisaspeciesthateatsawidevarietyoffoodsduringitslifetime.Andaspecialistisaspeciesthatfeedsonahighlyrestrictednumberoffoods.Agoodexampleofageneralistwouldbearat.Ratsarenotoriousforeatingjustaboutanythingthatsavailable,whetheritsaplantorananimal.Attheotherendofthespectrum,wehavethekoalawhicheatsonlytheleavesofeucalyptustrees.

Okay,nowthereareadvantagestoeach.Forageneralist,If1typeoffoodisntaround,itcanfeedonanotherthatsmoreabundant.Ontheotherhand,theadvantageofbeingaspecialististhattheanimaliswelladaptedtoitsfood.Youcouldsaythatspecialistsarefeedingmasters,theirconsumption,eventheirdigestivesystemisjustsofinelytuned.Forinstance,takethekoala.Theeucalyptusleavesthatitfeedson,dontcontainmuchprotein.Whatsmore,theleavescontaincompoundsthatarepoisonoustomostspecies?Butthekoalasdigestivesyste