听力原文:W: I'm sorry, Mike. I have to put off our meeting till four o'clock this afternoon. Mr. Anderson wants me to revise the annual report right now. M: Take your time. My schedule is flexible. Q: What does the man mean? (13)
A.
He doesn't mind having meeting ahead of schedule.
B.
He doesn't mind postponing the meeting.
C.
The meeting goes against with his schedule.
D.
The meeting is not on his schedule.
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【多选题】PGP(Pretty Good Privacy,优良保密协议)是一套用于消息加密、验证的应用程序,采用RSA加密、IDEA的散列算法验证。PGP加密由一系列( )的算法组合而成。