OG-31-OG12 第三章

ruiqijjkkl

Cheever College offers several online courses via remote computer connection, in addition to traditional classroom-based courses. A study of student performance at Cheever found that, overall, the average student grade for online courses matched that for classroom-based courses. In this calculation of the average grade, course withdrawals were weighted as equivalent to a course failure, and the rate of withdrawal was much lower for students enrolled in classroom-based courses than for students enrolled in online courses.


If the statements above are true, which of the following must also be true of Cheeer College?
A, Among students who did not withdraw, students enrolled in online courses got higher grades, on average, than students enrolled in classroom-based courses.
B, The number of students enrolled per course at the start of the school term is much higher, on average, for the online courses than for the classroom-based courses.
C, There are no students who take both an online and a classroom-based course in the same school term.
D, Among Cheever College students with the best grades, a significant majority take online, rather than classroom-based, courses.
E, Courses offered online tend to deal with subject matter that is less challenging than that of classroom-based courses.
选A。我一开始的理解跟答案完全相反。本来想求助，自己慢慢分析着忽然就懂了~呵呵！
题目中说，传统课堂的缺席率比网上课堂的要低，但是参加两种课堂的学生的的平均成绩差不多（match). 然而A说，在没有withdraw 的学生中，参与网络课程的学生的平均成绩比传统课堂要高（好弥补那些因为withdraw而fail掉的学生的低分)。

ruiqijjkkl

看看大虾们对我的理解支持否？有错误请告诉我哦~THX!