问题 单项选择题 A1/A2型题

加入哪种药物可以延长利多卡因局部注射的作用时间()

A.羧甲基纤维素钠

B.琥珀胆碱

C.去甲肾上腺素

D.阿托品

E.肾上腺素

答案

参考答案:E

解析:肾上腺素加入局麻药注射液中,可以延缓局麻药的吸收,减少吸收中毒的可能性,同时又可延长局麻药的作用时间,所以答案为E。

阅读理解

We are all busy talking about and using the Internet, but how many of us know about the history of the Internet?

  Many people are surprised when they find that the Internet was set up(建立) in the 1960s. At that time, computers were large and expensive. Computer networks(网络) didn’t work well. If one computer in the network broke down, then the whole network stopped. So a new network system(系统) had to be set up. It should be good enough to be used by many different computers. If part of the network was not working, information could be sent through another part. In this way the computer network system would keep on working all the time.

  At first, the Internet was only used by the government, but, in the early 1970s, universities, hospitals and banks were allowed to use it too. However, computers were still expensive and the Internet was difficult to use. By the start of the 1990s, computers become cheaper and easier to use. Scientists had also developed software(软件) that made “surfing(浏览)” the Internet more convenient (方便).

  Today it is easy to get on-line and it is said that millions of people use the Internet every day. Sending e-mail is more and more popular among students.

The Internet has now become one of the most important parts of people’s life.

根据短文内容,选择正确答案(10分)

小题1:The Internet has a history of ______ years.

A、about 40             B、less than 30         C、more than 45

小题2:Scientists set up a new network system to ______.

A、make the computer cheaper

B、make the system work well

C、make the computer go well

小题3:The Internet was widely used in the ______.

A、1960s                B、1970s                C、1990s

小题4:The underlined words “get on-line” in Chinese mean ______.

A、上机               B、上网                 C、接线

小题5:Which of the following is NOT true?

A、People had enough softwares to get on-line fifteen years ago

B、Computers are much cheaper than before.

C、Today the Internet is used everywhere.

单项选择题