下列哪项不引起心悸A．快速心室率的心房颤动B．频发室性期前收缩C．完全性右束支传导阻

在过滤、蒸馏、萃取和蒸发结晶等物质分离的实验操作中，用不到的仪器是

阅读理解。

     Beijing opera or Peking opera is a form of Chinese opera which arose in the late 18th century and

became fully developed and recognized by the mid-19th century. The form was extremely popular in

the Qing Dynasty court and has come to be regarded as one of the cultural treasures of China. Major

performance troupes (剧团,戏班子) are based in Beijing and Tianjin in the north,and Shanghai in the

south. The art form is also enjoyed in Taiwan,and has spread to other countries such as the United

States and Japan.

     Beijing opera features four main types of performers. Performing troupes often have several of

each variety,as well as numerous secondary and tertiary performers. With their elaborate (认真的,

精心的) and colorful costumes,performers are the only focal points on Beijing opera's characteristically

small stage. They make use of the skills of speech,song,dance,and combat in movements that are

symbolic and suggestive,rather than realistic. Above all else,the skill of performers is evaluated

according to the beauty of their movements. Performers also hold a variety of stylistic conventions that

help audiences navigate the plot of the production. The layers of meaning within each movement must

be expressed in time with music. The music of Beijing opera can be divided into the Xipi and Erhuang

styles. Melodies include arias (唱腔),fixed-tune melodies,and percussion patterns. The repertoire of

Beijing opera includes over 1,400 works,which are based on Chinese history,folklore,and,increasingly,

contemporary life.

     In recent years,Beijing opera has attempted numerous reforms in response to sagging audience

numbers. These reforms,which include improving performance quality,adapting new performance

elements,and performing new and original plays,have met with mixed success. Some Western works

have been adopted as new plays,but a lack of funding and an adverse political climate have left Beijing

opera's fate uncertain as the form enters the 21st century.

1. How long has Beijing Opera become a popular art form?

A. About one and a half centuries.

B. More than two centuries.

C. More than one century.

D. About half a century.

2. How many art forms of Beijing Opera at present?

A. Two including Beijing and Tianjin,and Shanghai in the south.

B. Two including Beijing and Tianjin in the north.

C. Three including Beijing and Tianjin,and Shanghai in the south and Taiwan.

D. Five including Beijing and Tianjin,and Shanghai in the south,Taiwan,US and Japan.

3. What are the features of the performers' movements of Beijing Opera?

A. Elaborate.

B. Colourful.

C. Realistic.

D. Representative.

4. Which of the followings is NOT true according to the passage?

A. Performers can take different stylistic traditions in the plays.

B. The standard to estimate a performer is the amount of his/her movements.

C. It's necessary to keep movements along the music in time.

D. The content of Beijing Opera is plentiful but much fixed.

5. What will be the future of the Beijing Opera?

A. Very bright.

B. Certainly good.

C. Much uncertain.

D. More popular.

英译汉：“foreign matter；germination”，正确的翻译为( )

A．对外事宜；发芽率

B．杂质；发芽率

C．杂质；回潮率

D．对外事宜；回潮率

试述可靠性、可靠指标、目标可靠指标之间的关系。

铁路数据网IP包传输时延应小于或等于（）

A.50ms

B.80ms

C.100ms

D.150ms