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单项选择题
A．About two million.B．About three million.C．About five million.D．About six million.
A．About two million.
B．About three million.
C．About five million.
D．About six million.
单项选择题
A．11-week course for control duty.B．11-week course for patrol duty.C．9-week course for control duty.D．9-week course for patrol duty.
A．11-week course for control duty.
B．11-week course for patrol duty.
C．9-week course for control duty.
D．9-week course for patrol duty.
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