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【参考答案】

or：and。这句话中前面运用的是并列结构，不是选择结构，应统一。
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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.
单项选择题
Which of the following best summarizes the main idea of the passage
A．Musical instruments developed through the years will sooner or later be replaced by computers.
B．Music cannot be passed on to future generations unless it is recorded.
C．Folk songs cannot be spread far unless they are printed on music sheets.
D．Tile development of music culture is highly dependent on its material aspect.
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