Cullen (1998) gave a detailed analysis of I-R-F communicative structure in a English classroom in senior high school in Tanzania. Pate and Bremer (1967) designed a questionnaire for 190 primary school teachers (grades 1-6) to ask for the most important purpose of asking questions in English reading class. It turns out that 86% of teachers believe that the purpose of questioning was to check students' learning ability, 54% of teachers thought that the purpose of questioning was "diagnosis", and 47% said that the purpose of questioning was to examine , the student's recollection of the particular facts, only 10% teachers thought that the purpose of questioning was to require students to generalize and infer from facts. It is obvious that the main purpose of questioning is not to arouse students' high level of thinking. Most teachers simply view questioning in the reading class as an examination of the results of the study. Besides, the most important function is that effective questioning can promote students' understanding of the text by stimulating their rational thinking.