Web reports about Jackson’s health began to _______ after some website said the star had been taken to hospital and given treatment.

A．circulate

B．translate

C．distinguish

D．Accelerate

关于氟牙症的叙述正确的是( )

A．指牙齿在发育期间的一种特殊的釉质发育不全
B．氟牙症一般只发生于乳牙
C．氟化釉质与正常釉质有明显区别
D．在氟牙症流行区饮水氟含量约在0.2ppm以下
E．牙釉质由羟磷灰石取代钙氟磷灰石