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第6部分：完形填空(第51~65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Sending E-mails to Professors One student skipped class and then sent the professor an e-mail(51)for copies of her teaching notes. Another (52)that she was late for a Monday class because she was recovering from drinking too much at a wild weekend party. At colleges and universities in the US,e-mail has made professors more approachable(平易近人).But many say it has made them too accessible, (53)boundaries that traditionally kept students at a healthy distance. These days,professors say,students seem to view them as available (54)the clock,sending a steady stream of informal e-mails. The tone that they take in e-mails is pretty astounding(令人吃惊的),said Michael Kessler,an assistant dean at Georgetown University.Theyll (55)you to help:I need to know this. Theres a fine (56)between meeting their needs and at the same time maintaining a level of legitimacy(正统性)as an(57)who is in charge. Christopher Dede,a professor at the Harvard Graduate School of Education,said (58)show that students no longer defer to(听从)their professors,perhaps because they realize that professors (59)could rapidly become outdated. | 
