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问题 选择题

—How wide is the Yellow River?

—That      from where to where.

A．depends

B．changes

C．refers

D．lies

答案

答案：A

填空题

把340分解质因数：______．
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单项选择题

In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.

A．binarytext

B．hypertext

C．plaintext

D．supertext
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