—— Mum, I think I’m ＿＿＿＿＿ to get back to school.

—— Not really, my dear. You’d better stay at home for another day or two.

A．so well

B．so good

C．well enough

D．good enough

简述RAM元件与ROM元件的存储原理的区别及其应用领域？