懂你英語l3-u2

1、懂你懂你Level31L3U214listeningScienceMatter’sstatetest1A1.Matterismadeofatomsmolecules.2.WaterfexampleistheH2Omolecules.3.Thismeansthatthemoleculeofwaterhasthreeatoms.4.Awatermoleculehastwohydrogenatomsoneoxygenatom.5.Substa

2、nceslikesugarhasmanyatomsintheirmolecules.6.Amoleculeofsugarhasmanyatomsincludingcarbonhydrogenoxygen.B1.MatterismadeofmoleculessuchasH2Owhichisthewatermolecule.2.Mattercanbeinoneofthreestatessolidliquidgas.3.Watericeare

3、thesamesubstancebuttheyareindifferentstates.4.Thesestatesdependonthetemperatureofthemolecules.5.Whenweheatthesubstancethemoleculesmovefastertrytotakeupmespace.6.Whenwecoolsubstancethemoleculesmovemeslowly.7.Whenwecoolasu

4、bstancetoitsfreezingpointitbecomesasolid.C1.Inasolidthemoleculesmoveverylittle.2.Theirpositionsarealmostfixed.3.Tobefixedmeansthattheirpositionsdon’tchange.4.Ifweheatthemoleculestheymovefasterawayfromeachother.5.Thesolid

5、beginstomeltlikeicecreamonahotday.D懂你懂你Level332.Twostudentsgotperfectsces.3.Thelowestscewassixtyeightoutofonehundred.4.Theaveragescewaseightysixpointthree(86.3).5.Elevenstudentsscedhigherthanaverage.6.Elevenstudentshadbe

6、lowaveragesces.I1.Tommissedtwoquestionsonthetestsohisscewasniytwo.2.Hisscewastheeighthhigherintheclass.3.Lisamissedtwohalfquestionssoherscewasniy.4.Herscedwasthetenthhighestsce.5.Herscewasfourpointshigherthantheaveragesc

7、e.J1.Lisawasdisappointedwithhertestresults.2.Shestudiedhardfthetestbutshestilldidn’tdowell.3.Asaresultsheplanstostudyhardfthenexttest.4.Thenexttestwillbeinabouttwoweeks.K1.Tomwassurprisedhappywithhistestresults.2.Hedidn’