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问题 单项选择题

肺心病心功能失代偿期多表现为（）

A.以右心衰竭为主

B.低氧血症

C.二氧化碳潴留

D.全心衰竭

E.肺水肿

答案

参考答案：A

解析：肺心病的主要表现为颈静脉怒张、肝肿大、下肢水肿等，发生机制为COPD时因肺小动脉收缩导致肺动脉高压，长期肺动脉高压将导致右室负荷增加，右心室扩大及肥大，右心失代偿则体循环淤血，出现上述临床表现。故本题选择A。

单项选择题

经《国务院关于完善企业职工基本养老保险制度的决定》（2005）扩展，目前我国基本养老保险覆盖范围包括下列（ ）：①国有、城镇集体企业职工；②外商投资企业职工；③城镇私营企业职工；④个体工商户；⑤灵活就业人员。

A．①②③

B．①②④

C．①②③④

D．①②③④⑤
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单项选择题

Roger Federer Lights up the Arabian Night
罗杰·费德勒点亮阿拉伯之夜


Plenty of people will be glad Tim Henman was not here to trouble Roger Federer once more last night，as the seedings said he should have been.Popular with the expatriates though he may be，and capable of upsetting Federer though he undoubtedly is，there is nothing quite so stirring as seeing one of the most gifted world No l s of all in full cry.
Instead of struggling with his jinx player，Federer imposed a spell of his own.He beat Andrei Pavel，whom Henman beat in the Paris Masters final，by6-3，6-3，and strode the court like a ruler who knows his aura is expanding.
It carried the Swiss imperiously into a semi-finals of the Dubai Championships，where he will face Jarkko Nieminen.The Finn earned his place by defeating the Dutch No 8 seed Sjeng Schalken 6-3,6-3.
Federer insisted he was not at his best-"I haven’t wanted to chase the fines as much as I should，"he said.
Pavel was driven to distraction as it was.He had akeady lifted himself near the level he showed when he was in the top 20.But just when he looked as if he might prolong the second set， Federer struck.
He retrieved one ball from deep，outside the tramlines on the forehand side，turned and reached the next ball from short and outside the tramlines on the backhand side，and still somehow hit a controlled winner.It completed the decisive break of serve.
Pavel responded by launching a spare ball towards the sky and it landed on the whiskey tables in the lrish village below.The umpire uttered a code violation warning in little more than a whisper.It was as though he felt sympathy for the Romanian.
If Federer reaches tomorrow’s final he will play Spain’s Feliciano Lopez，whose Davis Cup debut came in the singles in the 2003 final in Melbourne，or Mikhail Youzhny，whose first Davis Cup experience was as a ball boy in the 1995 final in Moscow.
That spurred Youzhny to make a top-level breakthrough seven yearslater，and to develop perseverance which has been revealed this week in a 6-3，1-6，6-1 quarter-final win over Rafael Nadal yesterday in heat which would have made a camel protest，and in a recovery from two days’vomiting after eating Japanese seafood."My cap felt as if it weighed five kilos."he said.

The author made a special mention of Mikhail Youzhny’s win at the quarter final because______.

A．he was greatly impressed by Youzhny’s experience as a ball boy
B．he admired Youzhny’s perseverance during the match
C．Youzhny was as persevering as a camel
D．Youzhny took to Japanese seafood which made him very weak
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