正常覆为上切牙切缘盖过下切牙唇面的垂直距离（）
A．3mm
B．4mm
C．5mm
D．颈1/3
E．切1/3
参考答案：E
房水回流入（）。
A.结膜囊
B.玻璃体
C.泪囊
D.巩膜静脉窦
E.眼前房
—How about ______ in the river with us —Sorry, I can't. My parents often tell me ______ that.
A. swim; don't do B. swim; to doC. swimming; not do D. swimming; not to do
为上切牙切缘盖过下切牙唇面的垂直距离（）颈1/3
为上切牙切缘盖过下切牙唇面的垂直距离（）颈1/3