问题
单项选择题
下述金属砷的性质，不正确的是（）
A.遇牙髓氧化成亚砷酸
B.作用较亚砷酸缓和
C.不会造成牙龈和牙槽骨的坏死
D.封药时间5～7天
E.可用于乳牙的牙髓失活
答案
参考答案：C
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下述金属砷的性质，不正确的是（）
A.遇牙髓氧化成亚砷酸
B.作用较亚砷酸缓和
C.不会造成牙龈和牙槽骨的坏死
D.封药时间5～7天
E.可用于乳牙的牙髓失活
参考答案：C
Dick had a toothache. His mother 36 him to the dentist. Before they saw the dentist, they 37 wait. “Please come in!” said a nurse in a 38 dress. Dick looked afraid 39 he came into the dentist’s room. “Now tell me. What’s wrong 40 you?” the dentist asked. “I feel terrible. I think I’ve a 41 tooth.” said the boy. “Well, let me have a 42 ”, said the dentist kindly. Dick 43 his mouth 44 the dentist began to examine（检查）his 45 .
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