“…Other variables that one can hypothesize will be of importance in affecting comprehension difficulty for multiple~choice tests are vocabulakY level (Graves, 1986), various measures of sentence complexity, such as sentence length (Klare, 1974(Klare, -1975, paragraph length (Hites, 1950), number of paragraphs (Freedle, Fine, & Fellbaum, 1981) and abstractness of text (Paivio, 1986). In particular, less frequently occurring words and longer sentence structures tend to make texts more difficult to understand, as can be inferred from their use in traditional readability formulas (Graves, 1986); in addition, longer paragraphs, and abstractness of texts also make passages more difficult to comprehend (see Hites, 1950, andPaivio, 1986, respectively).…”