题目信息
In general, jobs are harder to get in times of economic recession because many businesses cut back operations. However, any future recessions in Vargonia will probably not reduce the availability of teaching jobs at government-funded schools. This is because Vargonia has just introduced a legal requirement that education in government-funded schools be available, free of charge, to all Vargonian children regardless of the state of the economy, and that current student-teacher ratios not be exceeded.
Which of the following, if true, most strengthens the argument?
A:The current student-teacher ratio at Vargonia's government-funded schools is higher than it was during the most recent period of economic recession
B:During recent periods when the Vargonian economy has been strong, almost 25 percent of Vargonian children have attended privately funded schools, many of which charge substantial fees
C:Nearly 20 percent more teachers are currently employed in Vargonia`s government-funded schools than had been employed in those schools in the period before the last economic recession
D:Teachers in Vargonia`s government-funded schools are well paid relative to teachers in most privately funded schools in Vargonia, many of which rely heavily on part-time teachers
E:During the last economic recession in Vargonia, the government permanently closed a number of the schools that it had funded
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正确答案：
B:During recent periods when the Vargonian economy has been strong, almost 25 percent of Vargonian children have attended privately funded schools, many of which charge substantial fees
结论：有了新政策（1.公立免费 2.学生比老师的比率不上升），经济衰退时老师职位的availability不会减少
B选项：现在经济好，很多人读昂贵私立。--经济衰退，这些人中会有人去读公立—学生老师比分子上升，则分母老师必须上升来保持比率不上升。支持。如果其他情况使分子下降，分母老师可以同步下降，这时可能老师职位减少不能满足availability。
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