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
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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
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Why should you start your tour of London at 48 Doughty Street
A．Because Dickens once lived there.
B．Because Dickens died there.
C．Because it is owned by Dickens's descendants.
D．Because it was Dickens's first London hom
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