题目内容

_________is a file which is attached separately to a message that you send to someone, such as a graphic, a program, a sound or whatever.

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A ________ is a piece of computer software that you use to search for information on the Internet, especially on the World Wide Web.

A _________ is a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws

A___________ is a computer hacker who carries out illegal malicious hacking work.

__________ are instructions that are hidden within a computer program and are designed to cause faults or destroy data.