单项选择题

A．Her diet is not effective.
B．She has lost much weight.
C．Her favorite food is banana.
D．She has neither gained nor lost weight.
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S2. What are the things the author think teachers should do but haven’t done______.
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[C] usually involve a number of interacting diseases[B] involve populations with no prior exposure to a disease[D] are less responsive to medical treatment than are other diseases
A．According to the passage, virgin-soil epidemics can be distinguished from other catastrophic out- breaks of diseases in that virgin-soil epidemics______.
B．recur more frequently than chronic diseases
C．involve populations with no prior exposure to a disease
D．usually involve a number of interacting diseases
E．are less responsive to medical treatment than are other diseases
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