问题 单项选择题

关于用Ca(OH2)进行根管封药的说法错误的是()

A.促进根尖孔封闭

B.杀菌作用

C.刺激性小,安全无毒

D.促进根尖周骨组织修复

E.封闭牙本质小管

答案

参考答案:E

解析:Ca(OH)2作为较理想的根管消毒剂,作用为:对多种根管内细菌有杀伤作用,并能渗入牙本质小管发挥杀菌作用,效果明显,而且刺激性小,安全无毒;诱导作用,对根尖周病损严重的病例可促进根尖周骨组织的修复,并促进根尖孔的封闭。

阅读理解

It was a winter morning, just two weeks before Christmas 2005. While most people were warming up their cars, Trevor, my husband, had to get up early to ride his bike four kilometers away from home to work. On arrival, he parked his bike outside the back door as he usually does. After putting in 10 hours of labor, he returned to find his bike gone.

The bike was our only transport. Trevor used it to get to work, putting in 60-hour weeks to support his young family. I was so sad that someone would steal our bike that I wrote to the newspaper and told them our story. Shortly after that, several people in our area offered to help. One wonderful stranger even bought a bike, then called my husband to pick it up. Once again my husband had a way to get to and from his job. It really is an honor that a complete stranger would go out of their way for someone they have never met before.

People say that a smile can be passed from one person to another, but acts of kindness from strangers are even more so. This experience has had a spreading effect in our lives because it strengthened our faith in humanity as a whole. And it has influenced us to be more mindful of ways we, too, can share with others. No matter how big or how small, an act of kindness shows that someone cares. And the results can be everlasting.

小题1:Why was the bike so important to the couple? (Within 10 words)

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小题2:How did people get to know the couple’s problem? (Within 3 words)

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小题3:What do the couple learn from their experience? (Within 12 words)

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单项选择题 A1型题