— I'm going to San Francisco for a couple of days.

—    I wish I could get away for a while.

A．It doesn't matter

B．Forget it

C．I really envy you

D．I can't agree more

患者，女，25岁，切角缺损，烤瓷熔附金属全冠修复，半年后出现牙龈变色。此现象应属于下列哪方面的问题（）

A．生物学匹配

B．金-瓷匹配

C．适应性

D．再现性

E．色彩学匹配