单项选择题

According to the article, paper materials that are difficult to recycle include ______.

A．copy paper
B．document shred
C．food wrappers
D．bottles and cans
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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 technol0g~,
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
单项选择题
It can be learned from the passage that ______.
A．the existence of the symphony was attributed to the spread of Near Eastern and Chinese music
B．Near Eastern music had an influence on the development of the instruments in the symphony orchestra
C．the development of the symphony shows the mutual influence of Eastern and Western music I
D．the musical instruments in the symphony orchestra were developed on the basis of Near Eastern music
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