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1、课时作业15 Canada—“TheTrueNorth”Ⅰ.阅读理解(2015·湖北省黄石市示范三校元月联考)OnebaobabtreeinSouthAfricaissolargethatapopularpubhasbeenestablishedinsideitstrunk.Manylocalculturesconsiderbaobabtreestobesacred(神圣的).Othersusethemfortheirnutritiousfruits,eatableleavesandbeautifulflowers.Bu
2、tthesizehasnotnecessarilyprotectedthem.AccordingtoresearchpublishedinBiologicalConservation,twoofMadagascar'sbaobabtreespecieswilllosemuchoftheiravailablehabitatinthenext70years.Onespeciesmaynotsurvivetothenextcentury.Madagascarishometosevenoftheworld'seightbaoba
3、bspecies,sixofwhichcanbefoundnowhereelse.Thestudy—byscientistsfromtheFrenchagriculturalresearchcenterCIRAD—reliedonsatelliteimagesandfieldworktodeveloppopulationestimatesanddistributionmodelsforthreebaobabspecies.AllthreetreesarecurrentlylistedasendangeredontheIU
4、CNRedList.Thestudysuggeststhattwoofthespeciesshouldnowbereclassifiedasseriouslyendangered.Oneofthosespecies,A.perrieri,hadthelowestcurrentpopulation,withjust99treesobservedduringtenyearsoffieldstudy.Theresearchersestimatethatclimatechangewilldecreasethehabitatoft
5、hisspeciesfromabout21,000squarekilometerstodaytojustover6,500squarekilometersin2080.Thesecondspecies,A．suarezensis,hadahigherestimatedcurrentpopulationof15,000treesbutafarsmallerdistributionareaofjust1,200squarekilometers.Basedonclimatechangemodels,theresearchers
6、estimatedthatthedistributionofthisspecieswillcoverjust17squarekilometersby2050andcouldfacepotentialextinctionby2080.TheonebrightspotintheirstudywasA．grandidieri,thelargestandmostpopulousbaobabspecies.Theresearcherscountedanestimatedonemilliontreeswithadistributio
7、nofmorethan26,000squarekilometers.Thisisn'texpectedtochangemuchby2050.Astheresearcherspointout,there'snowhereleftforthebaobabstogo.ManybaobabtreescurrentlyareinProtectedAreaNetworks(PANs)establishedtopreserveMadagascar'sbiodiversity,buttheareasoutsidemanyPANshave
8、beenalmostcompletelychangedtoagricultureorcattlefeedingareas,leavingnoroomforthetreestoexpandtheirdistribution.TheresearcherswrotethattheexistingPANsysteminMad
