与洋葱鳞片叶表皮细胞相比，人的口腔上皮细胞没有（ ）
A：细胞壁
B：细胞膜
C：细胞质
D：细胞核
三角形中其交点到三边距离相等的是( )
— Do you have _________ shorts?
— No, we don't, But we have some jeans.
-- Are they about to have dinner?
-- Yes, it ______ in the dining room
