Most computer criminals have been common workers. Now the police wonder if this is “the tip of the iceberg”. As one official says, “I have the feeling that there is more crime out there than we are catching. What we are seeing now is all so poorly done. I wonder what the real experts are doing—the ones who really know how a computer works. ”

　　51. Which feature of computers makes computer theft possible?

　　A. They are fast, flexible and accurate to run every program.

　　B. They usually function normally.

　　C. They have no sense of what is right or wrong.

　　D. They have no reason to steal money.

　　52. The author uses the case of the head teller to show______.

　　A. how computer criminals do evil things

　　B. how hard it is to find a computer criminal

　　C. computers lack conscience

　　D. computer crime can involve a big sum of money

　　53. The head teller was found guilty of stealing______.

　　A. after the police examined the illegal gambling operation documents.

　　B. when the police broke up an illegal gambling operation.

　　C. after he was questioned in the unusual balance of an account.

　　D. when he was caught transmitting money from one account from another.

　　54. Why did the computer-tape librarian erase all the company's computerized records?

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