48. The gun ________, so the antique gun cost only $10 now.

A. without end was worthless              B. was too old

C. was not a real antique gun            D. was not old enough

C

Computers solve difficult problems and control the machine which is not simple. Many people use small computers called calculators to add, minus, multiply and divide numbers quickly. Scientists use large computers to solve many problems at the same time. You can play games with computers, and some computers can help you learn language. The Reading Machine is a special kind of computer. It can read books for blind people.

This machine is made of three sections: a scanner, a computer and a voice synthesizer. These three parts are like your eyes, your brain, and your voice. The scanner is the “eye” of the machine. It looks at the words on the page of a book and changes them into signals. These signals then go into the computer, the “brain” of the machine. The computer analyzes the signals and recognizes the words and then sends information about the words to the voice synthesizer. The voice synthesizer makes the sounds of the words.

To use the machine, a blind person simply opens the book and puts it face down on the scanner. The machine “reads” the words on the page. When one page is finished, the blind person turns the page and puts the book on the scanner again. The Reading Machine can read in a standard voice or in special fast voice. It can read words with small letters, large letters, or italics.

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