单项选择题

A．How primitive people used flags.
B．What the ancient means of communication was.
C．Why the torch towers were built.
D．How the Great Wall came into being.
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单项选择题
A．$5.B．$15.C．$30.D．$250.
A．$5.
B．$15.
C．$30.
D．$250.
单项选择题
A．They pay the same wage.B．They involve working outdoors.C．They can be substituted for college courses.D．They’re part-time.
A．They pay the same wage.
B．They involve working outdoors.
C．They can be substituted for college courses.
D．They’re part-time.
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