[Q2] Some wonders such as Notre-Dame, Circus Maximus and Alhambra include a field between two roads that touches the wonder. Is this field considered to touch the city or only the wonder (and therefore no city)?
[A2] The field only touches the wonder. A wonder is always neutral and not part of a city.
As a consequence, a farmer placed in a field only bordering a wonder but not the city adjacent to the wonder will not score points for this city. It is a similar case to a field only touching an abbey but not a city completed by the abbey.
Note that the field surrounding the monastery on the Notre-Dame wonder tile only touches the wonder.