单选题 What is the difference between larger classes and small classes?

A、 Larger classes often have some group discussions under the assistant instructor.
B、 Small classes often have some discussions on some assigned readings, etc.
C、 Larger classes' main work is to teach and small classes' main work is to discuss.
D、 Larger classes sometimes have group discussions and small classes have both lectures and discus sions.

【正确答案】 D

【答案解析】[参考译文]大班上课和小班上课的区别是什么?
[试题分析]这是考查考生对文章细节的了解。
[详细解答]大班以上课为主，有时分组讨论；小班则上课又讨论，比较灵活。A好象是说以讨论为主；B只讲了讨论；C亦说得不全。