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单项选择题

Which is NOT one of the main keys to recycling as mentioned in the passage

A．Government regulation of waste.
B．A more informed public,
C．Better technology.
D．More demand for recycled materials.

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单项选择题According to the author, music notation is important because ______.

A．it has a great effect on the music-culture as more and more people are able to read it
B．it tends to standardize folk songs when it is used by folk musicians
C．it is the printed version of standardized folk music
D．it encourages people to popularize printed versions of songs

单项选择题Which of the following best states the central idea of the passage

A．The Byzantine Empire was a unique case in which the usual order of military and economic revival preceding cultural revival was reversed.
B．The economic, cultural, and military revival in the Byzantine Empire between the eighth and eleventh centuries was similar in its order to the sequence of revivals in August Rome and fifth - century Athens.
C．The revival of the Byzantine Empire between the eighth and eleventh centuries shows cultural rebirth preceding economic and military revival, the reverse of the commonly accepted order of progress.
D．The eighth -century revival of Byzantine learning is an inexplic,~ ie phenomenon, and its economic and military precursors have yet to be discovered.