In relation to the formation of a contract in the context of the UN Convention for the International Sale of Goods, explain:

(a) the meaning of an offer; (5 marks)

下颌第一前磨牙形态的叙述错误的是（）

A.可见近中面沟

B.唇面五边形

C.颊尖明显大于舌尖

D.可见横嵴

E.牙冠舌倾