单项选择题

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

A．Frustrated.
B．Joyful.
C．Excited.
D．Sorry.
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单项选择题
A．offB．withC．toD．by
A．off
B．with
C．to
D．by
单项选择题
Research into the material culture of a nation is of great importance because ______ .
A．it helps produce new cultural tools and technology
B．it can reflect the development of the nation
C．it helps understand the nation’s past and present
D．it can demonstrate the nation’s civilization
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