their reading abilities.Many studies have shownРthat suitable reading materials can be introduced to students,and after the introduction, they can help improve students’performance on tests prehension and recall(Carrell,1 985;Brown&Alinesar,1 989).РLately,many researchers have turned their interests to the readability of the reading materials.The level of readability has been considered to be the number of new words, long words and long sentences allowed in the reading materials.Concerning the number of new words,Bright and McGregor(1 970,quoted in Nuttall,1 982:3 1)argue that theРideal text should contain new words at all while Nuttall(1 996:1 76)proposes one percent of new words for reading materials.But it is quite difficult for these specialists to reach any agreement on this point.Р5
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