集合竞价采用（）原则。
A.最优价格
B.时间优先
C.最大成交量
D.最小成交量
参考答案：C
解析：集合竞价采用最大成交量原则。
—Do you mind if I smoke here?
—______ You can go to smoke in the next door. [ ]
A. Yes, please.
B. Never mind.
C. You'd better not.
D. Of course not.
