[单项选择]Lecturing as a method of teaching is so frequently under attack today from educational psychologists and by students that some justification (理由) is needed to retain it. Critics believe that it results in (47) methods of learning which tend to be less effective than those which fully engage the learner. They also (48) that students have no opportunity to ask questions and must all receive the same content at the same pace, that they are exposed only to one teacher’’s interpretation of subject matter which will inevitably be prejudiced and that, anyway, few lectures rise above (49) . Nevertheless, in a number of inquiries this (50) assessment of lecturing as a teaching method proves not to be general among students, although they do fairly often comment on poor lecturing techniques. Students (51) lectures which are clear, orderly summary in which basic principles are emphasized, but dislike too (52) digressions (离题) or lectures which consist in part of the contents of a