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  3. It began as a game: high school and college students studying computer technology figured out they could use personal computers

It began as a game: high school and college students studying computer technology figured out they could use personal computers

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问题     It began as a game: high school and college students studying computer technology figured out they could use personal computers to break into telephone company computers and make free, long-distance telephone calls. These young computer wizards soon gained the nickname" hackers".
    Police put the collar on a few hackers,but many went on to even more complex hacking. One hacker was arrested for making illegal telephone calls and later used a jailhouse phone to alter a police officer’s credit records to get back at the officer for arresting him. The hacker also used a computer to alter his college records to give himself better grades. As hackers gained experience,they began invading computers at banks,airlines and other businesses. In one scheme,a hacker instructed an airline’s computer to give him free airplane tickets.
    The U. S. government is worried hackers may break into its sophisticated networks of defense computer. The government’s classified secrets are vulnerable because thousands of government computers are connected by telephone lines that hackers can tap into. In November 1988, a college student tapped into a non classified U. S. Defense Department computer network called Arpanet. The hacker injected a computer program that left copies of itself throughout Arpanet. Some hackers use each "viruses" to destroy all the data in a computer. But in this case,government officials shut down the network before the program reached every computer in the system. Shutting down the system angered many researchers who were using the computers. The hacker turned himself into police and told them how to get his program out of the computer system. He was charged with a crime.
    The incident put the spotlight on computer hacking in the United States. Many companies have hired experts to protect their computers from hackers, and many computer experts now advise companies on how to protect their computers.
    The U. S. government believes foreign governments have hired hackers to try to break into top-secret defense computers. It fears a hacker could inject a virus into military computers that would erase all the data during a war.
    Experts disagree over whether a computer network can ever be safe from hacking. But in the future, some of the most brilliant minds in the U. S. will be working to frustrate the efforts of computer hackers and spies.
The main idea of the article is______ (  )
选项 A、computer hackers only want to make free long distance phone calls
B、the government wants to hire computer hackers to spy on the Russians
C、computer hackers are a threat to private companies and government secrets
D、many companies have hired experts to protect their computers from hackers who carry viruses
答案C
解析 主旨题。“本文的主要内容是什么?”C选项“电脑黑客对私人电脑和政府机密是威胁”，是正确答案。A选项“电脑黑客只想打免费长途电话”；B选项“政府想雇佣电脑黑客监视俄国”；D选项“许多公司雇佣专家来保护电脑，使其不受携带病毒的黑客的进攻”，三个选项都不是全文主旨。
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