题干
33. - How about going to a concert this weekend?
- ______? It's a few months since I enjoyed myself in the last one.
A：Why
B：Why not
C：What for
D：What
答案(点此获取答案解析）
B
(
，其苯环上的二溴代物有9种同分异构体，由此推断A苯环上的四溴代物的同分异构体的数目有（ ）