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

Why should you visit Portsmouth Street

A．To see a place where Dickens worked.
B．To see the oldest shop in London.
C．To see the authentic setting of a Dickens novel.
D．To see some interesting modern architectur

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