问题 单项选择题

5岁患儿,自幼青紫,有蹲踞现象,胸片示肺血少。

患儿可出现

A.左室肥厚

B.右室肥厚

C.右室变薄

D.全心肥厚

E.全心缩小

答案

参考答案:B

解析:[解题思路] 法洛四联症为右向左分流型先天性心脏病。典型症状为青紫,一般在1岁内出现青紫、杵状指和蹲踞位,胸片示肺血减少。肺动脉狭窄可有青紫、肺血少,一般青紫出现晚.没有蹲踞现象。右位心一般无临床症状。室间隔缺损、动脉导管未闭均系左向右分流型先心病。无青紫、肺血增多。法洛四联症的听诊特点是胸骨左缘2~3肋间2~3/6级收缩期喷射性杂音.其杂音产生于肺动脉瓣狭窄,杂音的响度取决于肺动脉狭窄的程度,狭窄重,流经肺动脉的血少,杂音则轻而短。流经肺动脉血少,也影响肺动脉第二音,使其减弱或消失。因肺动脉狭窄,右室压力负荷加重,产生右室肥厚。

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

In the 60s, people asked about your astrological (about star) sign. In the 90s, they want to know your website.   1  Your website is an electronic meeting place for your family, friends and potentially, millions of people around the world. Best of all, you may not have to spend a cent. The web is filled with all kinds of free services and all it takes is some time and creativity.

  2  Like the table of contents of a book or magazine, the home page is the front door. Your site can have one or more pages, depending on how you design it.

While web pages vary greatly in their design and content, most use a traditional magazine layout(版面设计). At the top of the page is a banner(横幅). Next comes a greeting and a short description of the site. Pictures, text, and links to other websites follow.

  3  Think about whom the site is for and what you want to say. Next, gather up the material that you want to put on the site.

While there are no rules you have to follow, there are a few things to keep in mind:   4   If you are too much at the beginning, you may never get the site off the ground. You can always add to your site.

Less is better. Most people don’t like to read a lot of long text online.   55 

Smaller is better. Since it can take a long time to download large image files, keep the file sizes small.

Have the rights. Don’t put any material on your site unless you are sure you can do it legally. Always remember to get the permission from the writer first.

Now it’s time to roll up your sleeves and start building.

A.Start simply.

B.Break it into small pieces.

C.Draw a rough layout on a sheet of paper.

D.Many websites are considered very interesting.E.Before you start building your site, do some planning.

F.Think of your home page as the starting point of your website.

G.These days, having a web address is almost as important as a street address.

选择题