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people will not read the classics because they have got it into their heads that they are dull. ...... it is natural enough that, when they arrive at maturity, many persons should suppose that there is little in the great works of the past that can help them to deal with the anxious and harassing present. but a work becomes a classic only because succeeding generations of people have found pleasure in reading it. it does that because it appeals to the human emotions common to all of us and treats the human problems that we are all confronted with.

밑줄친 부분이 이해가 가질 않아서요.... it은 여기에서 작품을 가리키는 건가요 ?? 그러면 that 은 무엇을 가리키나요 ??
그리고 it과 that 사이의 does 는 무엇의 대동사로 쓰인건지... 너무 궁금해요...
해석지에는 보니깐 고전이 즐거움을 주는 것은 고전이 우리모둥게 공통적인 인간의 감정에 호소하며~~ 이렇게 나와있던데.... 꼭 알려주세요...ㅜㅠ

it과 that이 각각 가리키는 것... 그리고 does는 무엇의 대동사인지.. 친절한 답변 꼭 부탁드립니다.