必修1第四单元.ppt

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1、EarthquakesUnit4WarmingupandreadingYushuEarthquakeEarthquakesareusuallycausedwhenrockundergroundsuddenlybreaksalongafault.Thissuddenreleaseofenergycausestheseismicwavesthatmakethegroundshake.DidyouhearaboutTangshanEarthquake?Whendidithappen?TheTangshanEarthquakewasanaturaldisasterth

2、atoccurredonJuly28,1976.Itisbelievedtobethelargestearthquakeofthe20thcenturybydeathtoll.Thenumberofdeathswasaround240,000to255,000.Afurther164,000peoplewererecordedasbeingseverelyinjured.CanyoutellmeanythingaboutSanFrancisco?CanyouimaginewhatthecityofSanFranciscolikeaftertheearthqua

3、ke?Whatdoesthesentence“It’salwaysquietbeforeastorm”mean?Whatdoyouthinkwillhappenbeforeanearthquake?1)Brightlightflashesinthesky.2)Thewellhasdeepcracksinit,andthewaterinitrisesandfalls.3)Chickensareflyinganddogsarebarking,andpigsandcowsaretoonervoustoeat.4)Fishjumpoutofthepond,andmic

4、erunwildlyoutofthefields.SignsbeforeanearthquakeImagineyouhavetimetotakeonlyonethingbeforeanearthquake,whatwillyoutake?Why?FastreadingReadthetextandfindanswerstothefollowingquestions.1.Whenandwherewerethestrangethingshappening?Whatwerethey?2.Whydidthetextsaytheworldseemedtobeatanend

5、?3.Howwasthecitydestroyedafterthequake?4.Whendidthesecondquakehitthecity?Whatwastheresultofthat?5.WhocametohelpTangshanfirst?Andhow?Readthepassageandfindoutthetopicsentenceofeachparagraph.ParagraphTopicsentence1234StrangethingswerehappeninginthecountrysideofnortheastHebei.Everything

6、begantoshake.Itseemedasiftheworldwasatanend.Everywheretheylookednearlyeverythingwasdestroyed.Allhopewasnotlost.Jointhecorrectpartsofthesentences.1.Thechickensdidn’teatbecause2.Thepeopledidn’tworrybecause3.Suchagreatnumberofpeoplediedbecause4.Waterwasneededbecause5.Thepeopledidnotlos

7、ehopebecauseA.thearmycametohelpthem.B.thequakehappenedwhiletheyweresleeping.C.theywerenervous.D.damsandwellswereuseless.E.theydidn’tknowwhatthestrangeeventsmeant.DetailedreadingHowmanypartscanthispassagebedividedinto?ThreepartsDoyouknowthemainideaofeachpart?Part1Paragragh1Part2Parag

8、raph2、3Part3Paragra