A Too many structures are mixed so lower levels have problems decoding the text, and the vocabulary might not be relevant to the student's immediate needs.
B The texts can be too culturally biased, being necessary a good knowledge of cultural background when reading, and the vocabulary in the text might not be interesting to the student’s real life.
C Most of the texts are impossible to understand because of the cultural aspects involved, and the vocabulary is not relevant to the learner’s needs.
D The texts will not be useful if they are very old or outdated, and the time preparing the class is not worth considering the results achieved.
E Most of the texts found on the Internet are not suitable for the learner’s needs, presenting repetition of structures and demotivating the learner.