Unit4GrammarandpositionIntegratedskills課件-高中英語牛津譯林版（2020）選修第一冊_第1頁
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sciencegrammar&integratedskillsP481.Whyisthesaying“notwosnowflakesarealike”mentionedinParagraph1?DiscussionTointroducethe“SnowflakeMan”:WilsonBentley.Hediscoveredthatnotwosnowflakesareeverexactlythesame.2.HowdidWilsonBentleycapturetheworld’sfirstimageofasinglesnowflake?Heattachedhiscameratoamicroscopeandsetuphisequipmentoutside.Heworkedinthefreezingcoldforhoursatatime,carefullyhandlingeachsnowflakewithafeather,andphotographingitwitha90-secondexposure.3.WhatqualitiesdoesWilsonBentleyhave?Canyousupportyouropinionwithevidencefromthestory?DiscussionHewasapersonwithgreatdeterminationandpersistence.Overthedecades,Bentleyphotographedmorethan5,000snowflakes.Throughmanyyearsoftrialanderror,heexploredthesecretshiddenfromhumaneyes.Eventuallyhediscoveredthatnotwosnowflakesareeverexactlythesame.p49B21.Whatmakestheexistenceofsnowflakespossible?DiscussionThedustparticles.2.Whydosnowflakestakeonanendlessvarietyofshapes?TheshapesofsnowflakesareinfluencedbytemperatureandhumidityduringtheirdownwardjourneythroughtheEarth’satmosphere.Eachsnowflaketakesadifferentrouteandthusitencountersauniquemixofatmosphericconditions.1.Whatisyourunderstandingoffriction?2.Whatexamplescanyougiveaboutfrictioninyourdailylife?Frictioncanoccurbetweensolidsurfaces,likeyourtwohandsrubbingtogetherordrillinganailintothewall.Frictioncanoccurinliquidsorgases,likefrictionwiththewaterslowingdownaboatortheairslowingdownyourcar.1.Whatdoes“resist”inthetitlemean?Inthetitle,theverb“resist”hasadoublemeaning.Itcanmean“torefusetoacceptsomethingandtrytostopitfromhappening”.Meanwhile,itcanmean“tostopyourselffromhavingsomethingyoulikeordoingsomethingyouverymuchwanttodo”.Frictionisunavoidableindailylifeandhasgreatmystery,whichhasbeenfascinatingscientistsforcenturies.2.HowdidLeonardodaVincilearnaboutfriction?Heexperimentedwithfrictionbyslidingobjectsacrossdifferenttypesofsurfacesandmadetheconnectionbetweenfrictionamountanditsdeterminingfactorssuchassurfacetexture,evenwiththelimitedtechnologicalknowledgeavailablethen.3.Whatisthevalueofthemilestoneinthe21stcentury?Thisfindingcouldexpandourunderstandingofphysicalsystemsthatdependonfriction,frommicromachinestoearthquakes.4.Questionsonp50Ithinkithastwomeanings:inthenaturalworld,frictionisaforcethatisfoundeverywhereanddiff

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