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Unit 3 Inventors and inventions Ⅰ. 完形填空 阅读下面短文，掌握其大意，然后从1～15各题所给的A、B、C、D四个选项中，选出最佳选项。 One student took a box of chicken to class.Another carried on a cellphone __1__ and still another whistled loudly every time the __2__ turned his back.Reform school？No. College. More and more，professors say，they are coming across __3__ students in their classrooms.Many of today’s young scholars arrive late，leave __4__，talk loud or take care of personal __5__ such as paying bills during class.Why are the students behaving badly？“Because they can，” said a student of University of North Texas.“A lot of the time，the professors let them get away with it.” Some educators say it is time to bring politeness back to their classrooms and even __6__ taking some of the blame for bad behavior.They say that rude students are by no means the majority but that one of them can ruin an entire __7__. People are __8__ when they learn that impolite behavior is becoming more and more common in __9__ education，says Dr. Gerald Amanda，a counselor at City College of San Francisco.They __10__ some high school students to misbehave but think those who get to __11__ will behave more politely. Dr. Amanda believes that society in general has become more tolerant of rude behavior and that people in power，including professors，no longer __12__ standards for __13__.That leads to a growing imprudence(轻率行为)among some college students.“There’s a great deal of bad behavior in the world around them，and young people see it and __14__ disrespect，”said Dr. Amanda，__15__ that sometimes students “have no idea that they are being rude.” | 
