问题补充：
The Sina Microblog provides a good for those who want to express their opinions and exchange their ideas with others.
A. platform
B. boundary
C. teamwork
D. relationship
答案：
(答案→)A. platform
B. boundary
C. teamwork
D. relationship
解析：本题名词辨析。句意：新浪微博为那些想表达自己的意见和想同别人交换的想法的人提供了一个很好的平台。platform台；站台；平台；boundary分界线；范围；teamwork协力；配合；relationship关系；联系
