“兼听则明,偏信则暗”这一句古代格言出自( )
A.《资治通鉴》
B.《论语》
C.《荀子》
D.《史记》
参考答案:A
数字签名和手写签名的区别是________。
A.前者因消息而异,后者因签名者而异
B.前者因签名者而异,后者因消息而异
C.前者是0和1的数字串,后者是模拟图形
D.前者是模拟图形,后者是0和1的数字串
— There _____ be anybody in the classroom, for the lights are off.
— I'll go and check. [ ]
A. mustn't
B. won't
C. needn't
D. can't