胎儿及婴儿期发育遵循
A.头尾发展律B.向心律C.生长关键期D.轨迹现象E.赶上生长
参考答案:A
牙齿萌出特点不包括()
A.左右对称萌出
B.下牙先于上牙萌出
C.女孩比男孩换牙早
D.乳牙换牙时可有"生理性流涎"现象
E.乳恒牙换牙时间比顺序重要
-That actor often joins in different activities in Beijing. Do you know __________?
-For 5 years.[ ]
A. how soon he will come back
B. how long he has stayed there
C. when he went there
D. how long has he been there