此题为判断题(对,错)。
第1题:
Maggie ____the floor when she _____the door bell ring.
A:was sweeping … heard
B:swept … heard
C:was sweeping … was hearing
D:swept … was hearing
第2题:
A.pregnant
B.badly sick
C.dead
D.married
第3题:
如果Alice和Bob进行安全交互通信,则Bob不需要知道()
A.Bob的公钥
B.Bob的私钥
C.Alice的公钥
D.Alice的私钥
第4题:
Though a single in her early thirties, it has never occurred to her that it is high time that she ()married.
A.gets
B.should get
C.would get
D.got
第5题:
第6题:
5、若 Bob 给 Alice 发送一封邮件,并想让 Alice 确信邮件是由 Bob 发出的,则 Bob 应该选用 ()对邮件加密。
A.Alice 的公钥
B.Alice 的私钥
C.Bob 的公钥
D.Bob 的私钥