如图为番茄电池，下列有关说法中不正确的是

A．一段时间后，铜电极附近会出现蓝色

B．一段时间后，锌片质量会变少

C．锌电极是该电池的负极

D．电流由铜通过导线流向锌

He doesn't feel ________, ________ he has to see a doctor. [ ]

A. good enough, but

B. well enough, but

C. good enough, so

D. well enough, so