问题 单项选择题 案例分析题

患者男,49岁,因胸痛、呼吸困难3h入院,既往有高血压病史,入院前口服硝酸甘油无效。入院后体检发现CK-MB34.0ng/ml,肌钙蛋白4.21ng/ml,肌红蛋白28.0ng/ml。

根据患者上述表现,最可能的临床诊断是()

A.不稳定性心绞痛

B.急性肺栓塞

C.急性心肌梗死

D.自发性气胸

E.急性主动脉夹层

F.急性非特异性心包炎

答案

参考答案:C

阅读理解

阅读理解.

   Every people has their own way of saying things,their own special expressions.Many everyday American

expressions are based on colors.

   Red is a hot color.Americans often use it to express heat.They may say they are red hot about something

unfair.When they are red hot they are very angry about something.The small hot tasting peppers found in

many Mexican foods are called red hots for their color and their fiery(炽热的,暴躁的) taste.Fast loud

music is popular with many people.They may say the music is red hot,especially the kind called Dixieland

jazz.

   Pink is a lighter kind of red.People sometimes say they are in the pink when they are in good health.The

expression was first used in America at the beginning of the twentieth century. It probably comes from the

fact that many babies are born with a nice pink color that shows that they are in good health.

   Blue is a cool color.The traditional blues music in the United States is the opposite of red hot music.Blues

is slow,sad and soulful.Duke Ellington and his orchestra recorded a famous song-Mood Indigo-about the

deep blue color, indigo. In the words of  the song: "You aren't blue till you've  had that  Mood Indigo.

"Someone who is blue is very sad.

   The color green is natural for trees and grass.But it is an unnatural color for humans.A person who has a

sick feeling in stomach may say she feels a little green.A passenger on a boat who is feeling very sick from

high waves may look very green.

   Sometimes a person may be upset because he does not have something as nice as a friend has,like a fast

new car.That person may say he is green with envy.Some people are green with envy because a friend has

more dollars or greenbacks.Dollars are called greenbacks because that is the color of the back side of the

paper money.

   The color black is used often in expressions.People describe a day in which everything goes wrong as a

black day.The date of a major tragedy is remembered as a black day.A blacklist is illegal now.But at one

time, some  businesses  refused  to employ people who were on a blacklist for  belonging to unpopular

organizations.

1. If you had your wallet stolen while doing some shopping,you may call it ________.

A.a white day      

B.a black day

C.a red day  

D.a green day

2. Suppose Mr.Brown says he is very happy because his three children are all in the pink,this means all his

children are ________.

A.lucky and wealthy

B.gentle and modest

C.fit and healthy

D.creative and energetic

3. When she got home and found nothing had been done by her husband,Jane was really ________.

A.red hot  

B.green

C.blue  

D.black

4. In the following paragraph,the writer might tell the reader something about  ________.

A. unpopular organizations in the world

B.people's response towards a black day

C.the influence of the traditional blues

D.more words about a color,such as brown

单项选择题

阅读下面短文,回答文后问题。

据明人蒋一葵《长安客话》记述,昔日的永乐大钟,日供六僧击之,“昼夜撞击,声闻数十里,其声宏宏,时远时近,有异他钟”。如此美妙绝伦的钟声是怎么样形成的呢

从外表上可以明显看出,大钟的钟壁上下厚度不同,钟腰的厚度是94毫米,而钟口的壁厚是185毫米。测音表明,不同厚度的各个部分,都会产生相应的频率振动,发出不同的声音,而这众多分音的汇集就是一首雄伟的交响曲。

加上永乐大钟合理的合金成分比率,优雅钟声的出现就不是偶然了。明永乐大钟的成分中含铜 80.5%、锡16.4%及少量其他元素。当含锡在16%左右时,就能保证钟体强度、韧度适度,保持钟声振动的持续性;若含锡量过多或太少都会使钟声余音减短,那么就无法欣赏到永乐大钟闻声数十里的悠长钟声了。

同时还发现,永乐大钟的正下方,由一个直径4米、深0.7米的八角形地坑,它不单方便人们仰视大钟内壁,还有为钟声散音的功能,与现代舞台前乐池的声学作用异曲同工。

三管齐下方才造就了永乐大钟举世无双的完美音质。那么,明朝的能工巧匠是如何设计出这令人叫绝的声场呢

中国古钟千百年来的发展脉络有其自成一派的风格样式。中国钟的基本形状是钟声高度与口径之比在 1:0.7左右,西洋中则在1:1左右。中国钟用钟杵从外壁敲击,而西洋钟用钟舌从内部敲击,因而发出的声音比中国钟更加急促、高昂。

通过物理分析,钟声产生于撞钟引起的振动,而钟声的强弱、高低、音色主要取决于钟体的形状和材质。钟壁厚则钟声沉闷,反之清脆;钟体短而口径大则钟声消失得比较快,反之悠长。永乐大钟上端闭塞、下端钟口开放,形成钟顶小、钟腰细、钟身长、钟口外张似喇叭。当撞击时,引起钟声振动,使各分音的频率恰当,产生拍频现象。此外,成分分析的结果告示我们,永乐大钟的合金成分比率与《周礼·考工记》中的“六齐”大致相符。

本文第五段中“三管齐下”指的是()。

A.钟壁的厚度、合金成分的比率、钟体中杂质的含量

B.钟体的形状、合金成分的比率、钟壁的厚度

C.合金成分的比率、钟壁的厚度、钟下的地坑

D.钟下的地坑、古钟的风格、钟体中锡的含量