On the way home I met my friend John, from _______ home the thief had stolen a computer.

A．whom

B．which

C．that

D．whose

如图所示，流行性斑疹伤寒的病原体是()

A．普氏立克次体

B．莫氏立克次体

C．罗氏立克次体

D．立氏立克次体

E．加拿大立克次体