Rule reminder
Cohesion (coesione) = the formal/grammatical surface links between sentences: pronouns, connectives, ellipsis, lexical devices. A text can have cohesion without coherence (grammatically linked sentences that make no sense together) or coherence without cohesion (logically connected ideas expressed with repetitive or awkward grammar). Both are needed. At B2, you must identify which type of problem affects a given text.
'Ho letto il saggio di Halliday. L'ho trovato illuminante. Ne consiglio la lettura a tutti gli studenti di linguistica.' — What is the problem, if any?