Once __5__
to the host program,the viruses then look for other __6__ to “infect”.In this way__7__ throughout a hard disk or an entire organization when it infects a LAN or a multiuser system.At some point,determined by how the virus was programmed,the virus
__8__.The timing of the attack can be linked to a number of __9____10__.So-called “benign (良性的)” viruses might simply display a message.__11__ the system.The attack is to wipe out data,to __12__ files or to format the hard disk.
There are four main types of viruses: shell,intrusive,operating system and source ode.Shell viruses __13__
themselves around a host program and don't change the original program.Shell programs are __14__ to write,which is why about half of viruses are of this type.Intrusive viruses invade an existing program and actually insert a portion of themselves into the host program.Intrusive viruses are hard to write and very difficult to
__15__
without damaging the host file.
【语篇导读】 本文为说明文介绍了计算机病毒名称的由来病毒侵入解析 根据常识计算机上传染的有害程序与生物学中病毒之间有“相似性”才会叫计算机病毒。答案 D解析 从后文came from可知是指这个词的“来源”。答案 C解析 根据常识病毒应是“入侵”活细胞。答案 B解析 工厂应是答案 D解析 由前段末句中attaching a copy of themselves to another program可知此处指病毒程序“附加到”一个主程序上。原词复现。答案 Bks
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