问题 单项选择题

慢性心房纤颤伴快速心室率,首选治疗措施是

A.药物复律,使之恢复为窦性节律

B.积极治疗,预防栓塞并发症

C.减慢心室率,使心室率控制在60~80次/分,活动后心室率加快不超过100次/分

D.积极治疗原发病因

E.控制诱发因素

答案

参考答案:C

解析:慢性心房纤颤伴快速心室率的治疗目的是保持心功能正常,所以首选治疗措施是减慢心室率,控制心室率在理想的范围内,而其他几项治疗均不是首选。

阅读理解

阅读理解。

     1970 was World Conservation (保护) Year. The United Nations wanted everyone to know that the world

was in danger. They hoped that governments would act quickly in order to conserve nature. Here is one

example of the problem. At one time there were 1, 300 different plants, trees and flowers in Holland, but now

only 866 remain. The others have been destroyed by a modern man and his technology. We were changing the

earth, the air and water, and everything that grows lives. We can't live without these things. If we continue like

this, we shall destroy ourselves.

     What will happen in the future? Perhaps it is more important to Ask "What must we do now?" The people

who will be living in the world of tomorrow are the young of today. A lot of them know that conservation is

necessary. Many are helping to save our world. They plant trees, build bridges across rivers in forests, and so

on. In a small town in the United States a large group of girls cleaned the banks of 11 kilometers of their rivers. Young people may hear about conservation through a record called "No one's going to change our world". It

was made by the Beatles, Cliff Richard and other singers. The money from it will help to conserve wild animals.

1. There are few plants, trees and flowers in Holland now because _____.

A. there has been a lot of conservation in Holland

B. Holland does not need so many plants, trees and flowers

C. many plants, trees and flowers are dangerous

D. many plants, trees and flowers do not grow there any more

2. "No one's going to change our world" was _____. 

A. an important book published in 1970

B. an idea that nobody would accept

C. a record calling all people to conserve nature

D. a rule worked out by the United States

3. What is the most important thing to save our world?

A. We should plant more trees and flowers.

B. We should clean the banks of our rivers.

C. We should know what would happen in the future.

D. We should know what we must do and begin to do now.

判断题