单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

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．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.
单项选择题
A．$5.B．$15.C．$30.D．$250.
A．$5.
B．$15.
C．$30.
D．$250.
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