第23题: [单项选择]What does the woman mean A. Young people are too quick in making decisions. B. Young people seldom stay long on the same job. C. Young people lose their jobs easily. D. Young people are too eager to succeed. 参考答案:B 答案解析:[听力原文] M: It was the third time Ranger had phoned me to say he had a new job. W: It’s difficul
第24题: [单项选择]下列叙述不正确的是( )。 A. 公钥加密算法可用于保证数据完整性和数据保密性 B. 公钥加密算法可使发送者不可否认 C. 常规加密使用的密钥叫公钥 D. 公钥加密体制有两种基本的模型 参考答案:C 答案解析:[解析] 常规加密使用的密钥叫保密密钥,而不是公钥。