专升本英语（阅读）模拟试卷70
阅读理解
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 play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.
1.A computer is a machine designed to _______.(D)
A. perform work mathematically
B. perform complicated calculations
C. store and select information
D. all of the above
解析：由文章第一段第一句“A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it．”及后面的“These machines can do a great deal of complicated work in a very short time．”可知D项正确。
2.The selection calls the vacuum tubes the electronic computer’s_________.(D)
A. nerve cells
B. brain
C. nervous system
D. heart
解析：文章第二段第一句说到“The heart of an electronic computer lies in its vacuum tubes”，故选D。
3.The selection says that computers play an essential roles in_________.(A)
A. automation processes
B. mathematical computations
C. traffic control
D. the development of mathematical theory
解析：文章第三段最后一句说到“Computers play an essential role in modern automation in many plants and factories throughout the world．”其中“in modern automation”与A选项对应。
4.The use of computers for specialized purposes depends on the_________.(A)
A. design of computer
B. power used to operate the computer
C. difficulty of the mathematical calculations involved
D. the ability of the programmer
解析：文章第三段第一句话说到“Computers can be designed for many specialized purposes—they can be used to prepare payrolls，guide airplane flights，direct traffic，even play chess．”可推知电脑可以被设计用于不同的目的，因此正确答案为A。
5.The selection implies that human beings differ from computers in that human beings_________.(B)
A. make fewer errors
B. do not have to be programmed
C. work more quickly
D. understand their instructions
解析：文章第二段最后一句说到“…a computer must be given instructions–it must be programmed．”这是计算机和人的不同之处，故选B。
The \\
6.According to the article, the phrase \\(B)
A. the relation of wildlife to man
B. the adequacy of the food supply to support its animal population
C. the ratio of small game to predators
D. the destruction of predators
解析：the balance of nature的
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