根面平整是为了（）
A.消除龈下牙石
B.消除龈下菌斑
C.消除病理性牙骨质
D.造成硬而光滑的根面
E.以上都对
参考答案：E
You can only be sure of _____ you have at present; you cannot be sure of something _____ you might get
in the future. [ ]
A. that; what
B. what; /
C. which; that
D. /; that
新生儿生理性体重下降发生在出生后
A．第1周
B．第2周
C．第4周
D．第3周
E．第5周
