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
Why is Mary Hogarth interesting to students of literature
A．She shared a house with Dickens and his wife.
B．Dickens's love for her was the reason he started writing.
C．Her death is said to be the origin of a scene in one of Dickens's novels.
D．She is supposed to have appeared to Dickens as a-ghost.
单项选择题
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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