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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