In relation to contract law:

(b) Explain the provisions of the Civil Code in respect of an offer being modified by the offeror. (3 marks)

视网膜中央动脉主干阻塞表现为（）

A．突发一眼无痛性急剧的视力下降，甚至完全失明

B.突发一眼视力下降，完全失明伴眼痛

C.渐进性无痛性视力下降

D．渐进性视力下降伴疼痛

E．突发剧烈眼胀痛、头痛、虹视，视力急剧下降伴恶心、呕吐