单项选择题

Questions 32 to 35 are based on the following passage．
　 A national survey showed that many of America’s public school teachers spend their own time expanding the knowledge and skins．Professional training is a way of life for many teachers．Some even go to summer schools to learn new skills and keep up with advances in technology．
The average teacher has 25 years of classroom experience and mole than half hold a master’s degree．Nearly 23 percent began fulltime teaching within the past five years．This statistic should cause some concerns because it means a large number of teachers are reaching the retirement age．If this trend is not recognized，at some point this will result in an experience gap．
With salaries based on fewer hours and no overtime，the complaints of the teachers become more understandable．Many outsiders feel that the long summer vacations justify lower pay scales，but in reality，many teachers spend a good part of their vocation honing their skills for the upcoming year．Facing a classroom unprepared is tougher on the teacher than on students．
Even with all of these，three fifths of teachers(60 percent)said they would become teachers again．However，there were many who said they would not choose teaching as a career if they could start over again．
　For the first time，the survey sought the reasons for teachers leaving the profession．The most often cited reason(37 percent)for abandoning their training and professional experience was low salaries．Minority teachers(50 percent)，male teachers(43 percent)，and teachers under 30(47 percent)were most likely to claim low pay as the reason they will not stay in teaching．
Which of the following is most likely the reason that teachers would give up their job 　（）

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