患者女，35岁，要求上前牙美观修复。并自述全口牙萌出时均无光亮外表。查见全口牙面呈轻度白垩状，并有浅黄色斑条；两上颌中切牙唇面小块黄褐色斑。牙面均无实质性缺损。

应首先考虑的诊断是（）

A.猛性龋

B.氟斑牙

C.四环素牙

D.釉质钙化不全

E.釉质发育不全

— Could I please ______?　 

— Sorry, you can't. Your father has to use it. [ ]

A. do chores

B. go to the movies　　

C. use the car

D. go to school