A．Encourage people to undertake adventures.
B．Publicize his colorful and unique life stories.
C．Raise people's environmental awareness.
D．Attract people to America's national parks.

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.