单项选择题

The volunteers mentioned were paid to______.

A．find out about the reported cases of smallpox
B．vaccinate people in remote areas
C．teach people how to treat smallpox
D．prevent infected people from moving around

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单项选择题

Ali Maow Maalin's case is significant because he was the______.

A．last person to be cured of smallpox in Somalia
B．last known sufferer of smallpox in the world
C．first smallpox victim in the Horn of Africa
D．first Somalian to be vaccinated for smallpox

单项选择题

The work to stamp out smallpox was made more difficult by______.

A．people's unwillingness to report cases
B．the lack of vaccine
C．the backwardness of the region
D．the incessant local wars