（泰州市）牙科医生用金属 * * 面镜观察诊断牙病的情景．在环_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

（泰州市）牙科医生用金属 * * 面镜观察诊断牙病的情景．在环境温度较低时，医生总是先将平面镜放在酒精灯火焰上稍微烤一烤，然后才放入口腔．这样做的目的是（　　）

A．给平面镜消毒

B．以免太凉对口腔产生刺激

C．以免镜面上产生水雾而影响观察

D．增强镜面反光能力

答案

A、很多同学误以为放进口腔的东西，医生放到火上烧一下是为了消毒，其实主要目的不是为了消毒，医生用的医疗器械都已经是经过严格消毒的，不符合题意；

B、医生主要目的是观察口腔内牙齿病情，凉不是考虑的主要问题，让病人不再忍受牙痛才是主要的，不符合题意；

C、把金属 * * 面镜放到火焰上烤一下，平面镜的温度上升，比人体正常体温稍高一点放进口腔，液化现象就不会发生，使医生的检查能顺利进行，符合题意；

D、这样做不会增强反光能力，只是不影响反光能力，便于检查，不符合题意；

故选C．

单项选择题 A1/A2型题

关于分子生物学测定细胞因子的评价，哪项正确（）

A.特异性高

B.敏感性高

C.测细胞因子基因

D.操作简便

E.定量

完形填空

Sam’s uncle had an old bird which sat in its cage all day. One day his uncle said, “It is too expensive to 1  that bird. We will get rid of it.” But Sam wanted to   2   the bird.
Sam’s grandfather told him that the bird was once a famous 3   bird. Now 4 people knew it. His grandfather took the bird out, and then quickly took his arms away. The bird opened its huge   5  and flew into the sky. After a few minutes, it 6  with a small rabbit, cut it open and started to   7  it.
The next morning, Sam asked his uncle out. Sam did 8   his grandfather had done, but the bird 9  to the ground and stood still. Sam’s uncle 10 . Later his grandfather told him that the bird only hunted in late afternoon when light was less   11 . Sam asked his uncle to come out before   12 . This time the bird caught a mouse. His uncle was quiet with   13 , but laughed again, “We can’t eat mice, so this bird is   14 .” And he sold the bird without telling Sam.
Before Sam found the bird was 15 , two angry men arrived in a car. They 16   his uncle and said, the bird couldn’t hunt and they wanted their money back. Sam’s uncle looked 17  and said, “I have spent it. But… don’t worry!” He 18  at Sam, “Sam will show you 19   to make the bird hunt! It’s a great bird, isn’t it, Sam?” Sam opened the door of the car and took out the 20 . It flew away and disappeared forever.

C．looked after