对于骨型深覆，下列说法不正确的是（）

A.改正严重的骨性深覆难度很大

B.必要时可采用外科-正畸治疗

C.可采用正畸治疗轻度骨型深覆

D.固定矫治的同时常配合使用 * * 面导板打开咬合

E.下颌支过长，后、前面高度比例过大的患者，治疗不困难

A breast-feeding neonate will turn his head toward the mother’s breast in a natural instinct to find food. What is the name of this reflex()

A. Tonic neck reflex.

B. Moro’s reflex.

C. Grasp reflex.

D. Rooting reflex.