机体氟过量可能引起下列哪些症状
A. 氟斑牙
B. 大骨节病
C. 智力发育障碍
D. 氟骨症
E. 骨质疏松
It is improper to ____ (different) between pupils according to their family background.
He had been a strict father but was ____ (indulge) to his grandchildren.
We anticipate that we will meet a certain amount of ___ (resist) to our plan.