【導讀】well-knownas“CityofIceBall”.scenerythere.ofCanada.Falls.Oceanonthewest.Vancouver'sfirstpark.insouthernAfrica.Itsuppliesaboutone-fifthoftheworld'sfreshsurface. waterandnine-tenthsofthe.water.animalisbeaver.cross-Canadatrain.Whatis“TheTrueNorth”?6.Whatdoestheword“slightly”inthetextmean?