单项选择题


Questions 11 to 18 are based on the conversation yon 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
Advertisements are aimed at people suffering from mild complaints because ______.
A．they often watch ads on TV
B．they are more likely to buy the drugs advertised
C．they generally lead a sedentary life
D．they don’t take to sports and easily catch colds
单项选择题
A．4 hours.B．6 hours.C．12 hours.D．18 hours.
A．4 hours.
B．6 hours.
C．12 hours.
D．18 hours.
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