单项选择题

A．Happy.
B．Depressed.
C．Angry.
D．Cheerful.
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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.
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.
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
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