SummarizationRead each of the following short paragraphs and complete the phrase or sentence that expresses the main idea of the paragraph. The first letter of the missing word is given before the blank.Paragraph 5.One aspect of American education too seldom challenged is the lecture system. Professors continue to lecture and students to take notes much as they did in the thirteenth century, when books were so scarce and expensive that few students could own them. The time is long overdue for us to abandon the lecture system and turn to methods that really work.5. Lecture system needs to be c______.
【正确答案】：changed
【题目解析】：P93
