乳牙最晚于1.5岁时出齐。()
参考答案:错
— Tom’s never done extra work for his class, _______he?
—_______. He is the laziest boy in his class.
A.has; Yes
B.is; No
C.is; Yes
D.has; No
员工应处处礼让宾客,以客人为先,并主动为客人让路、开门、呼梯。