The Reading section consists of questions on 4–6 passages, each approximately 700 words in length. The passages are on academic topics; they are the kind of material that might be found in an undergraduate university textbook. Passages require understanding of rhetorical functions such as cause-effect, compare-contrast and argumentation. Students answer questions about main ideas, details, inferences, essential information, sentence insertion, vocabulary, rhetorical purpose and overall ideas. New types of questions in the TOEFL iBT test require filling out tables or completing summaries. Prior knowledge of the subject under discussion is not necessary to come to the correct answer.