At school，some students are active some are shy，yet they can be good friends with one another. (2012·四川，4)
A. while
B. although
C. so
D. as
网友回答
A. while
B. although
C. so
D. as
解析：A
解析 考查并列连词。句意为：在学校，一些学生很活跃而一些却很害羞，然而他们都可能彼此成为好朋友。根据句意选while，表示两个分句中两种情况的对比。