A．The first infected victim.
B．A coastal village in Africa.
C．The doctor who lust identified it.
D．A river running through the Congo.

A．They exhibit similar symptoms.
B．They can be treated with the same drug.
C．They have almost the same mortality rate.
D．They have both disappeared for good.

A．By inhaling air polluted with the virus.
B．By contacting contaminated body fluids.
C．By drinking water from the Congo River.
D．By eating food grown in Sudan and Zalre.