单项选择题

A．Susan is a fast worker.
B．Susan did Jack’’s homework.
C．Susan didn’’t to the homework on her own.
D．Susan has not finished her homework.
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单项选择题
According to the passage, virgin-soil epidemics can be distinguished from other catastrophic out- breaks of diseases in that virgin-soil epidemics______.
A．recur more frequently than chronic diseases
B．usually involve a number of interacting diseases
C．involve populations with no prior exposure to a disease
D．are less responsive to medical treatment than are other diseases
单项选择题
A．The man was out of mind.B．He drank a few beers in the party.C．He lost his directions to his home.D．He took some drugs in the party.
A．The man was out of mind.
B．He drank a few beers in the party.
C．He lost his directions to his home.
D．He took some drugs in the party.
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