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问题 单项选择题

关于食管下段括约肌（LES）的结构与功能，下面哪些说法是不正确的（）

A.正常人LES长为3～4cm

B.LES的作用是防止胃内容物反流入食管

C.一过性LES松弛不发生于正常人

D.腹内压升高、胃内压升高可导致LES压力降低

E.正常人休息时LES压为10～30mmHg

答案

参考答案：C

解析：LES是指食管末端3～4cm长的环形肌束，正常人休息时LES压力为10～30mmHg，为一高压带，防止胃内容物反流入食管。一些因素可影响LES压力降低，如腹内压增高及胃内压增高均可影响LES压相应降低而导致胃食管反流。正常人在吞咽时LES松弛，食物得以进入胃内。一过性LES松弛（TLESR）与吞咽时引起的LES松弛不同，无先行的吞咽动作和食管蠕动的刺激，松弛时间更长，LES压的下降速率更快，LES的最低压力更低。正常人也有TLESR，但较少。

单项选择题

破产试点城市的破产国有企业职工自谋职业的，按照国务院有关文件规定，可一次性付给安置费，标准不高于破产试点城市的企业职工上年平均工资收入的( )。

A．1倍

B．2倍

C．3倍

D．5倍
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单项选择题

Questions 3—4 are based on the following:
Magazine editor: I know that some of our regular advertisers have been pressuring us to give favorable mention to their products in our articles, but they should realize that for us to yield to their wishes would actually be against their interests. To remain an effective advertising vehicle we must have loyal readership, and we would soon lose that readership if our readers suspect that our editorial integrity has been compromised by pandering to advertisers.
Advertising-sales director: You underestimate the sophistication of our readers. They recognize that the advertisements we carry are not articles, so their response to the advertisements has never depended on their opinion of the editorial integrity of the magazine as a whole.

Which one of the following is the most accurate assessment of the advertising-sales director’s argument as a response to the magazine editor’s argument

A．It succeeds because it shows that the editor’s argument depends on an unwarranted assumption about factors affecting an advertisement’s effectiveness.

B．It succeeds because it exposes as mistaken the editor’s estimation of the sophistication of the magazine’s readers.

C．It succeeds because it undermines the editor’s claim about how the magazine’s editorial integrity should be affected by allowing advertisers to influence articles.

D．It fails because the editor’s argument does not depend on any assumption about readers’ response to the advertisements they see in the magazine.

E．(E) It fails because it is based on a misunderstanding of the editor’s view about how readers respond to advertisements they see in the magazine.
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