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问题 单项选择题 A2型题

男，37岁。在心脏手术过程中，病人心电图表明：突然发生Ⅲ度房室传导阻滞。此时该用何药作紧急处置（）

A.静注阿托品

B.静滴异丙肾上腺素

C.静注肾上腺素

D.静滴山莨菪碱

E.静滴去甲上肾腺素

答案

参考答案：B

解析：阿托品可用于迷走神经过度兴奋所致的房室传导阻滞，改善患者的临床症状。但其用量需十分谨慎，剂量过低时，可引起进一步的心动过缓；剂量过大，则可加重心梗。而异丙肾上腺素具有强大的加速传导的作用，舌下或静脉滴注给药可使房室传导阻滞明显改善。静脉滴注时，可根据心率调整滴速。因此，综合多种因素，选用异丙肾上腺素较为合适。

阅读理解
阅读理解。
     Su Hua is studying at Cambridge, UK. She has bought a bicycle and is worried about security
(安全). Her friend, Kate, found this article and sent it to her.

     Introduction
     A lot of crime is against bicycles. About 150,000 bicycles are stolen every year and most
are never found. You can prevent this happening by following a few careful steps.
     Basic Security
     Do not leave your bicycle in out-of-the-way places. Always lock your bicycle when you
leave. Secure it to lampposts or trees. Take off smaller parts and take them with you, for
example lights and saddles (车座).
     Locks
     Get a good lock. There are many different types in the shops. Buy one that has been tested
against attack. Ask for a recommendation from a bike shop.
     Marking
     Security marking your bike can act as a deterrent to a thief. It can also help the police find
your bicycle. It should be clearly written and include your postcode and your house or flat
number. This will provide a simple way to identify your bicycle.
     Registration
     There are a number of companies who will security mark your bicycle for you. They will
then put your registration number and personal details on their computer database. Then if
your bicycle is found it will be easy to contact you.
     Finally
     Keep a record of the bicycle yourself: its make, model and registration number. You can
even take a photograph of it. This will prove the bicycle belongs to you.

1. Which part of the text gives you information on how to lock up your bicycle when you leave it?
A. Locks.
B. Marking.
C. Registration.
D. Basic Security.
2. The underlined phrase "act as a deterrent to a thief" means ______.
A. help you recognize your bike
B. help the police find your bicycle
C. stop someone stealing your bicycle
D. stop you worrying about your bike
3. The article advises you to keep a record of your bicycle _______.

A. in the bike shop and your computer
B. in the police station and a security company
C. in a security company and your university
D. by yourself and in a security company

4. The main purpose of this article is _________.
A. to tell you what to do if your bicycle is stolenB. to suggest ways of keeping your bicycle safe
C. to give you advice on where to buy a good lock
D. to say why you shouldn't keep your bicycle in a quiet place
查看答案
单项选择题 A1/A2型题

上消化道出血除呕血外常出现黑便，其机制是（）。

A.血红蛋白与肠内硫化物结合形成硫化铁

B.血红蛋白与肠内硫化物结合形成硫化亚铁

C.血红蛋白与肠内细菌分泌的氨基酸氧化酶结合

D.血红蛋白与肠内的肠激酶结合

E.血红蛋白与肠内的黏液结合
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