鼠疫耶尔森菌的传播媒介：

.Everyfternoon group of old women pss down the rod outside my house._______ lod of firewood.ech crrying. . B．ech of them crries C．ech of whom crrying D．with ech crriesA．each carrying． ．B．each of them carriesC．each of whom carryingD．with each carries