会计学UNIT4Attn:weakformsof“a,and”,link-ups,andcontractionsinthedialoguePart2ListeningandNote-takingReferenceAnswerPartIDialoguesKeytotheexercise:PassageHide-and-Seek1.Wordsandexpressions:Part3NewsNewsItem1vocabularyNewsitem2KeysforExerciseNewsitem3WordsandExpressions:Section30ralWorkPART1Section4SupplementaryExercisesPART1Passage2Name:TheUnitedStatesEnvironmentalProtectionAgency.19701.thenation’senvironment2.theair,waterandatmosphere1.anumberorenvironmentalthreats2.havebeencleanedup3.anumberofcrises