如果确诊涎石位于颌下腺导管与腺体交界处，治疗多采用
A. 保守疗法
B. 抗生素治疗
C. 颌下腺切除术
D. 颌下腺导管取石术
E. 颌下腺导管结扎术
饮水氟化后，仍可使用的氟防龋措施是
A. 氟片
B. 氟滴剂
C. 氟化泡沫
D. 食盐氟化
E. 饮水加氟后，不需再使用任何氟防龋措施
呼衰最早出现的表现是
A. 紫绀
B. 精神神经症状
C. 心率快，血压下降
D. 呼吸困难
E. 消化道出血
Why did the author go past Sheftel's？
A. He was on his way to work.
B. He was looking for a present for his niece.
C. He wanted to buy some envelopes.
D. He liked to look in the shop windows.
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