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
Which factor pushed up house prices
A．Many young men, who live alone, have increased demand for houses.
B．Many young men need to rent more houses.
C．It is easy to apply for a mortgage for young generation.
D．The number of older people, many of whom live alone, becomes bigger and bigger.
单项选择题
Paragraphs 2 and 3 explain ______.
A．those good things are not without side effects
B．why clever advertising is so powerful
C．why in modern times self-medication is still practised
D．why people develop faulty ways of life
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