第一节 完形填空(共10小题；每小题2分，满分20分)
阅读下面短文，掌握其大意，然后从1~10各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
More and more professors say they are coming across rude students in their classrooms. Many of today’s young students arrive late, leave ___21___, talk loud or take care of persona business such as ___22_   bills during class. Why are the students behaving badly?
Some educators say it is time to bring   23    back to their classrooms and even start taking some of the blame for bad behavior. They say that rude students are by   24    means the majority but that one of them can   25   an entire class.
People are surprised when they learn that impolite behavior is becoming more and more common in   ___26_ education. Dr.Amanda, a professor from City College of San Francisco believes that society in general has become more tolerant (容忍的) of rude behavior and ___27___ people in power, including professors, no longer set standards for politeness which ___28___ a growing imprudence (轻率行为) among some college students. “There’s a great deal of bad behaviour in the world ___29___ them, and young people see it and develop disrespect,” said Mr. Amanda, ___30___ that sometimes students “have no idea that they are being rude”.
21.   A. late     B. early   C. secretly      D. quietly
22.   A. Filling      B. changing    C. writing       D. paying
23.   A. politeness   B. teaching     C. thinking     D. progress
24.   A. that    B. this     C. no      D. every
25.   A. have   B. take    C. escape D. ruin
26.   A. better  B. more   C. higher D. younger
27.   A. why    B. how    C. whether      D. that
28.   A. leads to      B. is due to     C. refers to     D. gets to
29.   A. around       B. about  C. behind       D. over
30.   A. speaking    B. adding       C. warning     D. pointing