下列说法正确的是
A：棱锥的侧面都是三角形
B：有六条侧棱的棱柱的底面可以是三角形
C：长方体和正方体不是棱柱
D：柱体的上、下两底面可以大小不一样
-- Li Ming said he would come here, _______ he hasn't arrived.
-- Don't worry. He is on the way. ______, there is much traffic, so it will take more time.
