单项选择题

A．In a laboratory.
B．In a drugstore.
C．In a supermarket.
D．In the dining hall.
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单项选择题
In the United States influenza is one of the ten principle causes of death.
A．Y
B．N
C．NG
单项选择题
The author’’s primary purpose in this passage is to suggest people receive flu vaccines.
A．Y
B．N
C．NG
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