问题补充：
--- Can you tell me how many study groups there are in a class?
--- Generally speaking, a class often 8 study groups, each with 7 group members.
A. is consisted of
B. is made of
C. made up of
D. consists of
答案：
A. is consisted of
B. is made of
C. made up of
(答案→)D. consists of
解析：考察固定词组。Consist of=be made up of由…组成；
