懂你英语L3 Unit 2

Unit2-1Listening物质、原子和测试Matterismadeofatomsandmolecules.Water,forexampleistheH2Omolecule.Thismeansthatthemoleculesofwaterhave3atoms.Awatermoleculehas2Hydrogenatomsand1oxygenatom.Substanceslikesugar,havemanyatomsintheirmolecules.Amoleculeofsugarhasmanyatomsincludingcarbon,hydrogenandoxygen.MatterismadeofmoleculessuchasH20,whichisawatermolecule.Mattercanbeoneinthreestates,solid,liquidorgas.Waterandiceareinsamesubstancebuttheyareindifferentstates.Thesestatesdependonthetemperatureofamolecule.Whenweheatthesubstance,themoleculesmovefasterandtrytotakeupmorespace.Whenwecoolsubstances,themoleculesmoveslowly.Whenwecoolasubstanceinitsfreezingpoint,itbecomesasolid.Inasolid,themoleculesmoveverylittle.Theypositionsarealmostfixed.Tobefixedmeansthattheirpositionsdon’tchange.ifweheatthemolecules,theymovefasterandawayfromeachother.Thesolidbeginstomeltlikeanicecreamonahotday.Atacertaintemperature,thesolidbeginstochangeintoliquid.Thetemperatureatwhichasolidchangeintoliquiddependsonthesubstance.Forwater,thesolidbeginstochangeintoaliquidwhenitstemperaturerisesabout0degreeCelsius.Forsomesubstances,suchassteel,thetemperaturewhichitbecomesaliquidismuchhigher.Steeloftenmeltsataround1370℃.Ifwecontinuetoheattheliquid,themoleculesmoveevenfaster.Atacertaintemperature,theliquidbeginstochangeintogas.Forwater,theliquidbeginstochangeintoagasat100degreesCelsius.Thisistheboilingpointofwater.Insidethestart,suchasoursun,thetemperatureisveryhigh.Everythinginsidethesunisthegas.Accordingtoscientists,thereareover65elementsinsidethesun.theseincludeoxygenandiron.Over90%ofthesunishydrogengas.Yesterday,therewasanimportantsciencetest.Lisa,Tomand20otherclassmatestookthetest.Thetestisaboutthestatesofmatterandhowtheyaredifferent.Therewere25questionsonthetextandtherehad45minutestotakeit.Herearesomeofthetestresult.2studentsgotperfectscores.Thelowestscorewas68outof100.Theaveragescorewas86.3.11studentsscorehigherthanaverage.11studentshavebelowtheaveragescores.Tommissed2questiononthetestsohisscorewas92.Hisscorewas8highestintheclass.Lisamissed2andahalfquestionsoherscoreis90.Herscoreis10highestscore.Herscoreis4pointshigherthantheaveragescore.Lisawasdisappointedwithhertestresults.Shestudiedhardforthetestbutshestilldidn’tdowell.Asaresult,sheplanstostudyharderfornexttest.Thenexttestwillbeinabout2weeks.Tomwassurprisedandhappywithhisresults.Hedidn’tstudyhardsohisresultwasbetterthanheexpected.HewasalsohappythathedidbetterthanLisadid.Unit2-1vocabulary情绪和活动Sheisscreamingbecausesheisveryscared.Somethingischasinghersosheisscreamingforhelp.Heisshoutingbecauseheisangry.Whenheisreallyangry,heoftenshoutslikethis.Sheissleepbecausesheistired.Lastnightshedidn’tgetenoughsleepsotodayshedidn’tgetenoughenergy.She’scrybecauseshe’ssad.Shegotsomebadnewsafewminutesago.She’ssmilingbecauseshe’shappy.Herboyfriendwasjustcalledandheisreturningfromalongtrip.Thismanishikingupamountaintrail.Heiswearinghikingbootsandiscarryapackonhisback.Thismanenjoyscooking.Heattendsacookingclassonceaweek.Thiswomanenjoysgardening.Shegrowsflowerssuchasrosesandvegetablessuchastomatoesinhergarden.Thisboylovesplayinggames.Helikesallkindsofgamesincludingthisvideogameonhiscomputer.Thisoldcoupleenjoystraveling.Theytakeseveraltripsayearoftentodifferentcountries.Unit2-1dialogue迟到和考试成绩Oh,thereyouarefinally.Yeah,I’msorry.Whyareyousolate?Youweresupposedtobehere30minutesago.Igotonawrongsubwaybymistake.Whydidn’tyoucall?Iwasreallyworried.Idon’thavemyphone.IleftitintheofficebecauseIwasinsuchahurrytogethere.Ok,you’reherenow.wedon’thavemuchtime.Yes,wewillhavetohurry.Themeetingstartsin15minutes,right?Yes,itsupposedtoandeveryonegetshereontime.Didyoureadmypresentation?Yes,Idid.It’sgoodandbutit’sabittoolong.I’mafraidtherewon’tbeenoughtimeforquestions.Doyouhaveanysuggestions?Yes,Ido.Ithinkthecompanyintroductioncanbecutinhalf.Theyknowwhatwedo.Ok,Iwon’tshowthevideo,it’sabout2minuteslong.There’sagoodidea.Thevideoisonourwebsiteandit’snotthatgoodanyway.Doyouhaveothersuggestions?Not,Idon’t.I’msureyouwilldothegreatjob.Areyouready?Yes,I’mready.Themeetroomisonthe21stfloor.OK,let’sgo.Howdidyoudothisyesterdaysciencetest?Ididbetterthanexpected.Howaboutyou.Ididn’tdoverywell.IexpectedtodobetterthanIdid.Whatwasyourscore?Igota90.Whataboutyou?Igota92.Ionlymissed2questions.SoyoudidbetterthanIdid.AndIreallystudyforittoo.That’sasurprise.YouusuallydobetterthanIdo.Yes,Iwascareful.Imadeonereallystupidmistake.Whatwasit?Isaid90%ofthesunisHeliuminsteadofhydrogen.Wow,therewasastupidmistake.Whatwastheaveragescorefortheclass?Doyouknow?Theaveragescoreis86.3andthelowestis68.Doyouknowgotthelowesttestscore?No,Idon’t.Idon’tknowwhogotthelowestscore.It’sprobablyasecret.Diditanyonegetaperfectscore?IthinkAdaandSanjaybothgetaperfectscore.Yes,theyalwaysdowell.IwishIwereassmartastheyare.Unit2-2Listening日本和中国旅游In6weeks,Paulisgoingonatrip.HeisgoingtoJapanandChina.Thereareacoupleofreasonsforthetrip.Onereasonisforbusiness.He’sthinkingaboutstartingrestaurantsinbothcountries.Theotherreasonwasforpleasure.Heenjoystravelingandhe’dliketovisitsomefriends.Yesterdaywewentonlineandmadeair