题目内容
（请给出正确答案）
[主观题]
In paragraph 3, the author mentions diagrams as an example of a new way toA．chart the hist
In paragraph 3, the author mentions diagrams as an example of a new way to
A．chart the history of innovation in musical notation
B．explain the logic of standard musical notation
C．design and develop electronic instruments
D．indicate how particular sounds should be produced
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