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问题 单项选择题 A型题

以下为不典型的二度Ⅰ型房室传导阻滞的心电图表现，但应除外（）。

A.心室漏搏后的第一个PR间期不恢复反而延长

B.RR间距进行性缩短

C.PR间期延长无一定规律

D.心室漏搏前的PR间期意外地延长

E.出现连续2次心室漏搏

答案

参考答案：B

解析：二度Ⅰ型房室传导阻滞有时表现为不典型文氏现象，如：心室漏搏前的PR间期可意外地延长，或出现连续两次心室漏搏，或漏搏后的第一个PR间期不恢复反而延长。其原因是由于前一次激动在交界区发生隐匿性传导，使交界区产生新的不应期，随后的P波遇其相对不应期则可发生传导延缓致PR间期延长，遇其有效不应期则可发生连续2次心室漏搏现象。RR间距进行性缩短，至形成一个长RR间距结束文氏周期属于典型的二度Ⅰ型房室传导阻滞的表现。

完形填空
Could the Internet be totally free and should it be？Should the Internet be regulated？The recent disorder in the Arab world ____ by a disputed(有争议的) video damaging the image of Prophet(先知) Muhammad shows the United States，which is busy ____ global Internet freedom，has paid a huge price ____ the lives of its diplomats.
In an unregulated Internet world，cheating，violence or rumors can ____ serious consequences.Many countries across the world are periodically suffering from “rumors” ___ by the Internet and social media.
The US­led West always promotes Internet freedom and ____ any regulation as investigation，but it should think twice if it calculates the heavy price that has been and has to be paid for “____ Internet”．Moreover，____ the Internet in the West __9__ to be free，with no obvious ____ and no limited sites，isn’t the structure of the main pages already hand­controlled，with selected press agencies and ____ occupying clearly dominating(显著的) positions?
The Internet has helped fight injustice，____ corruption in places so far apart as Indonesia，India and Latin America.But the Internet could be extremely ____ as well.Various racist or separatist organizations are using their Internet sites to ____ strong feelings.Those who are spreading hate are frequently using the Internet as their tool.No country can ____ to make the Internet absolutely free.
The question is how to keep free flow of information ___ while protecting children from unhealthy works，common citizens from ____ rumors and countries from unfair and damaging propaganda(宣传) attacks.And who sets the limits?
The ____ is that there will never be a perfect system.Every country will have to ____ its own system，based on its culture，social ____ and the degree of danger it’s facing.
小题1:
A．ledB．caused
C．damagedD．attacked
小题2:
A．helpingB．processing
C．promotingD．improving
小题3:
A．forB．at
C．with D．off
小题4:
A．bringB．reach
C．fetchD．take
小题5:
A．spreadB．exposed
C．deliveredD．passed
小题6:
A．supportsB．follows
C．opposesD．dislikes
小题7:
A．freeB．accessible
C．availableD．healthy
小题8:
A．as if B．even if
C．so thatD．in that
小题9:
A．happensB．intends
C．offersD．appears
小题10:
A．interruptionB．interference
C．defenseD．preference
小题11:
A．programsB．substances
C．channelsD．sources
小题12:
A．uncoverB．strike
C．prevent D．avoid
小题13:
A．beneficialB．useful
C．sensitiveD．destructive
小题14:
A．increaseB．decrease
C．upsetD．strengthen
小题15:
A．refuseB．afford
C．failD．attempt
小题16:
A．unpolluted B．unskilled
C．unoccupiedD．uninterrupted
小题17:
A．evil B．meaningful
C．untrueD．effective
小题18:
A．importanceB．conclusion
C．description D．possibility
小题19:
A．developB．invent
C．changeD．study
小题20:
A．trendsB．structures
C．surroundingsD．factors
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单项选择题

狭窄性腱鞘炎时最有效的治疗方法是（）

A.手术

B.局部注射类固醇

C.离子导入

D.夹板

E.电刺激
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