单项选择题

Nowadays, smallpox investigations are only carried out______.

A．at regular two-yearly intervals
B．when news of an outbreak occurs
C．in those areas with previous history of the disease
D．by a trained professional
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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
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
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