下面哪一种加密算法属于对称加密算法A．RSA B．DSA C．DES D．RAS

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问题单项选择题

下面哪一种加密算法属于对称加密算法

A．RSA

B．DSA

C．DES

D．RAS

答案

参考答案：C

解析：对称算法也叫做常规加密、保密密钥或单密钥加密，常见的如DES，TDEA，RC5和IDEA。

完形填空

口语应用在下列横线上填入适当的话语，使对话完整、正确。（共5小题，每小题3分，满分15分）

A: Hi，Alice! I’ve sent you an e-mail. Have you got it?

B: 小题1: . I haven’t checked my e-mails today.

A: Why not?

B: 小题2: It doesn’t work.

A: 小题3:

B: No, I can’t. It’s too old. My father wants to buy a new one for me.

A: That’s good news. You know, I’ve just got a new computer.

B: 小题4:

A: I got it last week.

B: Where was it made?

A: 小题5:

B: What? How would it be made in your home?

A: You see, my father bought different parts of the computer and then put them together. That’s how the computer was made in my home.

B: Aha, I see.

问答题简答题

简述手机电视。