乳牙广泛浅龋治疗所用药物不包括
A.2%氟化钠
B.8%氟化亚锡
C.硝酸银
D.38%氟化氨银
E.30%过氧化氢溶液
参考答案:E
— What do you think of your new English teacher?
— She was well prepared for her first lesson and left us a good ______. [ ]
A. expression
B. instruction
C. appearance
D. impression
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