FormJulytoOctobereveryyear,aboutaquarteroftheworld’sblu...
問題詳情：FormJulytoOctobereveryyear,aboutaquarteroftheworld’sbluewhalesfeedinthePacificOceanoffthecoastofCalifornia.Butthewhalesnowfaceamajorthreatintheirfavoritefeedingarea.Lotsofshipscarryingcargosa...