Quiz Four

Part I Reading Comprehension

Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. You should decide on the best choice and write the corresponding letter on your Answer Sheet. Then write your translation of the underlined sentence on your Answer Sheet.

Passage Two

　　 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 (减去) nine thousand times a second, multiply (乘) a thousand times a second or divide five hundred times a second. Its percentage of error is about one in a billion 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 (晶体管). 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.

Key

6. A	7. C	8. C	9. B
10. 计算机是一种进行数学计算并储存和选择所输入信息的机器。

6. The speed with which an electronic computer works depends on its ________.
	A. electronic circuits
	B. vacuum tubes, or transistors
	C. programmer
	D. instructions
7. The selection says that computers play an essential role in ________.
	A. mathematical computations
	B. traffic control
	C. automation processes
	D. the development of mathematical theory
8. The use of computers for specialized purposes depends on the ________.
	A. power used to operate the computer
	B. difficulty of the mathematical calculations involved
	C. design of the computer
	D. the ability of the programmer
9. The passage implies that human beings differ from computers in that human beings ________.
	A. make fewer errors
	B. do not have to be programmed
	C. work more quickly
	D. understand their instructions
10. A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it.


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