FromJulytoOctobereveryyear,aboutaquarteroftheworld’sblu...
问题详情：FromJulytoOctobereveryyear,aboutaquarteroftheworld’sbluewhalesfeedinthePacificOceanoffthecoastofCalifornia.Butthewhalesnowfaceamajorthreatintheirfavoritefeedingarea.Lotsofshipscarryingcargosa...