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