The word "it" underlined in Paragraph 3 most probably means _______

单选题The word "it" underlined in Paragraph 3 most probably means ________.

at the heart of相当于inside，因此A为答案。

1The "Mozart problem", as defined by the author, is that _________.

2The word "them" in the phrase "the complexity and effect of his use of them" in Paragraph 4 refers to _________.

3In the expression "a single bar of it" in the last paragraph, "it" refers to ________.