【题目】 A ______ copy is a copy of a current file made in order to protect against loss or damage.

1、[单选题]The abbreviation FPGA stands for Field ________Gate Array.

• A、Program
• B、Programmable
• C、Programming
• D、Programmer

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2、[单选题]The data, when they are not encrypted, are called ________.

• A、plaintext
• B、ciphertext
• C、hypertext
• D、context

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3、[主观题]【翻译】硬盘驱动器

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4、[单选题]Data ______ can reduce the amount of data sent or stored by partially eliminating inherent redundancy.

• A、compression
• B、conversion
• C、configuration
• D、compilation

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5、[单选题]Confidentiality of the message is not enough in a secure communication; ________ is also needed. The receiver needs to be sure of the sender’s identity.

• A、encryption
• B、authorization
• C、authentication
• D、encapsulation

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