Despite the concerns about absenteeism, schools are increasingly experimenting with ways to let students watch or listen to lectures on their computers or digital music players, like iPods. Last month, Harvard Medical School began “Podcasting” lectures. Students can download them into digital musical players, and study while they, say, go for a walk.

　　As many academics accept the electronic innovation, others are pushing back. To encourage attendance, they are applying low-tech tactics, like giving more surprising quizzes or cutting back their online offerings.

　　Lee Chanian, a UCLA economics professor, says “too much technology leads to passive learning environment and encourage more absenteeism”. He now puts fewer lecture materials online, and provides extensive notes only for the most complicated topics.

　　67. The underlined word “absenteeism” in paragraph 2 most probably means ________.

　　A. attending classes

　　B. having classes

　　C. giving classes

　　D. skipping classes

　　68. At times only 20 or so undergraduates showed up for Americ Azevedo’s class because ________.

　　A. so many undergraduates relied on digital learning aids

　　B. so many undergraduates have off-campus jobs.

　　C. his lectures were boring

　　D. the exam was easy to pass

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