Humans must have some compact representation of the information needed in their brains, as well as an effective procedure to interpret each question properly and extract the right answer from the stored representation. To pass the mini-Turing test, therefore, we need to equip machines with a similarly efficient representation and answer-extraction algorithm.
This is the mental representations i have discussed on beautiful bioinformatics... And reading allows us to extract those mental representations from the minds of other people, so that we needn't go through the hardwork necessary to do so ourselves.