The ruler on the bed. It’s on the floor.[ ]
A. is
B. are
C. isn't
答案：C
计算机病毒极强的再生和扩散特性称为病毒的
A．Telnet和FTPB．Modem和ISDNC．IE和NetscapeD．Outlook Express和FoxmailE．Internet和Intranet
最有诊断意义的检查是
A．穿刺B．CTC．MRID．B超E．X线摄片
