问题 单项选择题

铁剂治疗缺铁性贫血的早期疗效观察的简便可靠指标为()

A.红细胞总数升高

B.血清铁增加

C.血清铁饱和度升高

D.网织红细胞升高

E.红细胞平均血红蛋白正常

答案

参考答案:D

解析:这是一道理解记忆题,主要考核缺铁贫血治疗后铁代动力学改变和临床的关系。错选率约10%,主要的错选答案是B和C。本题所提供的答案均是缺铁性贫血用铁剂治疗后的有效表现,但本题的关键词有两个:①早期;②简便可靠。给予铁剂后缺铁状态改善,造血必然增加,网织红细胞是红细胞的前期阶段,网织红细胞数的增加先于红细胞数和血红蛋白的增加,网织红细胞计数的升高出现最早(给予铁剂后的3~4天),而且检测方法容易,结果可靠,通过血常规的网织红细胞计数就能检出。从铁剂治疗后铁代动力学改变来看,虽血清铁升高也是早期改变,但作为早期疗效判断指标,它不及网织红细胞计数敏感。此外,血清铁和血清铁饱和度检测方法相对复杂,而且血清铁生理变异大,每日同一时间测定的结果变异系数可达30%,故它不能满足"简便可靠"的要求。故不是最好的答案。

阅读理解

According to a new education survey, student safety has become a big problem. Nearly 50 percent of the students say they are worried about robbery on the way to and from school. Now in many big cities in China,some schools have taught an unusual lesson. self-protection;Students like this lesson as there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.

Chen Haoyu,a teacher at Beijing No. 25 Middle School and a self-protection expert,gives young students advice on how to deal with danger.

If you are robbed, keep calm. If you cannot cry for help or run away, give the robber your money, try to remember what the robber looks like and tell the police.

If you are in a traffic accident and if you are hurt by a car, take down the car number;if it is a bicycle, try to contact your parents before you let the rider go. This is because you don’t know how seriously you are hurt.

Don’t stay in high places and keep away from trees if it is raining hard and there is lightning.

Get away as fast as you can when there is a fire.Put wet things on your body and try to find an exit. Do not take the lift!    

If someone is drowning and you can’t swim, don’t get into the water. Cry out for help.

Remember that danger is never as far away as you think. Take care of yourself at all times!

小题1:Why do students like the self-protection lesson?

A.Because there is advice on exams

B.Because they can learn how to protect themselves.

C.Because they like self-protection experts.

D.Because they have lots of exams during the lesson.小题2:The underlined word “contact” means_________.

A.end up

B.wait for

C.search for

D.get in touch with小题3:If your house is on fire, you must __________.

A.put dry things on your body

B.run quickly and take the lift

C.take everything you have and then run away

D.run away and find an exit as quickly as you can小题4:If you see a child fall into the river and you are not able to swim, you _______.

A.should telephone the doctor

B.can jump into the river and save him

C.can do nothing

D.should shout for help小题5:What’s the best title for this passage?

A.Protection

B.Advice on how to deal with danger

C.The popular lesson

D.An interesting lesson

多项选择题