龋病期间不形成或形成很少修复性牙本质的是
A．中龋B．深龋C．急性龋D．慢性龋E．继发龋
参考答案：C
The fact has worried the people across the world ___________ the earth is becoming warmer and warmer these years.
A．what
B．which
C．that
D．where
古代著名的纺织工艺家及贡献。
