下颌智齿冠周炎向外前方扩散可致（）
A.眶下间隙感染
B.面颊瘘
C.翼下颌间隙感染
D.下颌骨边缘性骨髓炎
E.下颌下间隙感染
参考答案：B
Many students in China are nearsighted. The underlined part means ______. [ ]
A. have poor eyesight
B. look very short
C. have good eyesight
D. wear sunglasses
幼儿与婴儿相比（）
A．呼吸减慢
B．脉搏加快
C．咀嚼功能增强
D．精细动作发展
E．患病机会增多
