资格英语-托福分类模拟题练习一.doc托福分类模拟题练****一Passage1NorthAmericanGrasslandsInNorthAmerica,,extendingfromtheedgeoftheRockyMountainsinthewesttothedeciduousforestintheeast,(16inches)inthewestto80cm(31inches)intheeast•Averageannualtemperaturesrangebetween10degreesand20degreesCelsius(50to68degreesFahrenheit).InthemoistregionsoftheNorthAmericangrasslands,especiallyinthenorthernGreatPlains,rainfallisdistinctlyseasonal,,theGreatPlainsgrasslandswereonevast,;1 1Muchoftheprairieisnowfarmland,agriculturalregionintheworld,,barley,soybeans,corn,upythelandthatwasonceprairie. 1Inareasgivenovertograzinglandsforcattleandsheep,,whenstreamsflowedintunnelsbeneathglaciallyformedsandyridges•WhentheIceAgeendedaround12,000yearsago,theretreatingglacierscreatedabout25milliondepressionsacrossa300,000-square-milelandscape--about83po
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