标题: 这题感觉是C，居然是B，求解释~ [打印本页] 作者: frankzhiwei 时间: 2010-10-2 00:07 标题: 这题感觉是C，居然是B，求解释~ Of those person who became teachers in 1968 and who later left the profession, 30 percent today earn salaries above $35,000 a year: of those who became teachers in 1968 and have remained in the profession, only 15 percent today earn salaries above $35,000 a year. These figures indicate how underpaid teachers are today.
The argument above depends on which of the following assumptions about the persons for whom statistics are cited?
(A) At least one-third of the group of persons who have remained in teaching would today be earning more than $35,000 a year if they had left teaching.
(B) The group of persons who left teaching and the group who did not are comparable in terms of factors that determine how much people outside the teaching profession are paid.
(C) Most of those persons who left teaching did so entirely because of the low salaries teachers earn.
(D) As a group, those persons who have remained in teaching are abler and more dedicated than the group of persons who left teaching.（B）
(E) The group of persons who left teaching and who today earn more than $35,000 a year were more capable teachers than the group who remained in the profession.
d 是加强，方向对但太过了；如果a 是50%的话，a 也对；c的错误在于：因为工资低而离开并不能说明老师事实上underpaid了，如果市场价格给清洁工是$5 per hour, 我嫌工资低而离开 能说明$5 per hour 不合理吗？e 是削弱underpaid的观点，指出离开的人挣得多是因为能力强。