患者，男，35岁，因急性根尖周炎行根管治疗，开始1周症状明显缓_爱下问搜题

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问题单项选择题 A1/A2型题

患者，男，35岁，因急性根尖周炎行根管治疗，开始1周症状明显缓解，因工作出差不能及时就诊，3个月期间换了3次FC封药，第三次封药后症状加重，主要应考虑的原因可能是（）

A.感染没有控制

B.药效丧失

C.药物半抗原作用

D.机体抵抗力降低

E.操作中带入新感染

答案

参考答案：C

解析：FC为甲醛甲酚的简写，甲醛类药物可作为半抗原与牙髓和尖周组织的宿主蛋白结合，形成免疫原引起机体免疫反应。

判断题

对韧性金属材料进行切削时，为了改善切削条件，可将宽的切屑分成狭窄的切屑，目的是提高刀具寿命。( )

完形填空

I was sitting in the surgical waiting area at the hospital waiting for word of my wife's operation. The small room was filled with other families and friends, who were ___36___ waiting to hear how their loved ones were doing.
There was a young boy sitting quietly in the ___37___ . He held a small box of ___38___ in one hand and a tablet(写字板) in the other. Every so often he'd place the tablet on his lap and draw something. As the hours passed I began to see the room almost ___39___ . And there was a strange silence.
"Daddy, when is Mommy going home?" the young boy asked, breaking the ___40___.
"Tomorrow." his father replied. The boy picked up his crayons and ___41___ something on the tablet.
I ___42___ him as he moved his feet back and forth, looking up at the ceiling and then toward the sunshine-filled window. "When's ___43___, Daddy?" he asked. His father ___44___ him over to sit by him. "Come, ___45___ here next to me," he said with a gentle tone in his voice.
___46___ his things, the little boy walked slowly to his father's side from the corner.The man ___47___ out and held his son by his shoulder.
"There are three days in life. Yesterday, today and tomorrow. One is over and done, one we live in, the other we ___48___ . We can't live in yesterday, but if we are happy enough today, we will be even happier tomorrow," he said in an attempt to ___49___ the boy.
The little boy looked at him for a moment and said, "If Mommy is going home tomorrow, I'll be ___50___. So, I want it to be tomorrow already, Daddy."
Now hanging on every word of this ___51___ , I leaned forward to hear his response. It was ___52___.
"Son, the one great thing about today is once it ___53___, it is already almost tomorrow."
I thought about how ___54___ it was. Even in my adult life, I still live waiting for what tomorrow may ___55___. Now I know that it is already "almost tomorrow".

C．conversation

C．interesting