单项选择题

The doctor in Singapore performed a valuable service by ______.

A．finding the subgroup of the virus
B．developing a cure
C．keeping his patients apart from others
D．reporting the outbreak to W. H. O.
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单项选择题
Mugging are most likely to occur ______.
A．in the suburbs rather than in the city
B．in the ghettos rather than in the fringe areas of the city
C．in the fringe area of the city rather than in the city center
D．in Washington rather than in any other American cities
单项选择题
It doesn't happen very often, but it does happen in the capital city of the United States. It refers to ______.
A．a theft
B．a burglary of a home
C．a mugging
D．an arrest by police
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