听力原文: A computer is a machine designed to perform. work mathematically and to store and select information that has been fed into it. It is run by either mechanical or electronic means. These machines can do a great deal of complicated work in a very short time. A large computer, for example, can add or subtract nine thousand times a second, multiply a thousand times a second, or divide five hundred times a second. Its percentage of error is about one in a billion digits. It has been estimated that human beings making calculations average about one mistake per two hundred digits.
The heart of an electronic computer lies in its vacuum tubes, or transistors. Its electronic circuits work a thousand times faster than the nerve cells in the human brain. A problem that might take a human being two years to solve can be solved by a computer in one minute, but in order to work properly, a computer must be given instructions--it must be programmed.
Computers can be designed for many specialized purposes--they can be used to prepare payrolls, guide airplane flights, direct traffic, even to play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.
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A.One in a billion digits.
B.Zero.
C.One mistake per two hundred digits.
D.One in a million digits.
第5题
A.脾肺气虚型的小儿遗尿症多发于病后,睡中遗尿,尿频而量少
B.脾肺气虚型的小儿遗尿症患儿可面色无华,神疲气短,自汗乏力
C.脾肺气虚型的小儿遗尿症患儿可食欲不振,大便溏薄,易反复感冒咳喘
D.脾肺气虚型的小儿遗尿症患儿可面色?白,智力迟钝,小便清长,尿量多,畏寒肢冷,腰腿酸软
E.脾肺气虚型的小儿遗尿症患儿可舌质淡,苔薄白,脉细无力
第7题
治疗小儿遗尿肺脾气虚证的首选方剂为()。
A.菟丝子散
B.导赤散
C.缩泉丸
D.补中益气汤合缩泉丸
E.桑螵蛸散
第10题
治疗遗尿脾肺气虚型的首选方为
A.麦味地黄丸
B.补中益气汤
C.六君子汤
D.补中益气汤合缩泉丸
E.桑螵蛸散
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