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The computer virus is an outcome of the computer overgrowth in
the 1980s. The cause of this term is the likeness between the biological
virus and the evil program infected with computers. The origin of this
term came an American science fiction 'The Adolescence of P-1' written 【S1】______
by Thomas J. Ryan published in 1977. Human viruses invade a living
cell and turn them into a factory for manufacturing viruses. 【S2】______
Therefore, computer viruses are small programs. They replicate by attaching 【S3】______

A.
B.
C.
Shell
D.
【S1】


【参考答案】

came ∧ an→from
came ∧ an→from 解析：缺漏错误。“来自于，来源于”应当用come f......

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