The inference shows in the two excerpts is J. The first excerpt shows how rare it is for someone who appreciate an old piano, while the second excerpt how people overvalue all musical instruments.
It should be noted that an inference simply means the conclusion that can be deduced based on the evidence given in a literary work.
In this case, the inference shows that the ddifference between the two excerpts is that the selection from The Piano Shop on the Left Bank shows how rare it is for someone who appreciate an old piano, while the selection from the article "Those Old Piano Blu how people overvalue all musical instruments.
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