不需要做间隙保持器是下列哪种情况（）。
A.第一恒磨牙早失
B.恒前牙早失
C.乳尖牙早失
D.乳磨牙早失
E.乳牙接近脱落时拔除时
参考答案：E
Do you know the __ boy? He is three years __ than me.[ ]
A. young; younger
B. young; young
C. younger; younger
D. younger; young
HTC T9199手机导航支持GPS+AGPS。
