Q：The passage is mainly about______ .

　　why computer crimes are difficult to detect by systematic inspection.

　　Why computer criminals are often able to escape punishment.

　　How computer criminals manage to get good recommendations from their former employers.

　　Why computer crimes cant be eliminated.

　　Because作了回答。这也就是全文要告诉读者的关于计算机犯罪清除不了的原因，故选D。)

　　例2 Certainly it has extended the scope of human conflicts, since it impartially disseminatesthe useful knowledge of scientists and the nonsense of the ignorant, the affection of the affectionate and the maliceof the malicious.

　　Q:The author describes the telephone as impartial because it______.

　　saves lives of people in remote places.

　　Enables people to live alone if they want to.

　　Spreads both love and ill will

　　Replaces much written communication.

　　例3 The primary reason why it was revolutionary is that it led to great social change

　　Q：According to the author, the introduction of the composer is a revolution mainly because .

　　the computer has revolutionized the working of the human mind.

　　The computer can do the tasks that could only be done by people before.

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