Bob is ______ eleven-year-old boy, but he knows a lot about Chinese history.

A.Alice的公钥

B. Alice的私钥

C. Bob公钥

D. Bob的私钥

A．Where is Bob now

B．Where does Bob do

C．Where’s Bob from

A.Alice 的公钥

B.Alice 的私钥

C.Bob 的公钥

D.Bob 的私钥

A.Alice的私钥

B.Alice的公钥

C.Bob的私钥

D.Bob的公钥

A.Alice可以保证Bob收到消息M

B.Alice不能否认发送过消息M

C.Bob不能编造或改变消息M

D.Bob可以验证消息M确实来源于Alice

A.Bob的私钥

B.Bob的公钥

C.Alice的私钥

D.Alice的公钥

Now that Bob is sharing child-raising and ______ tasks with his wife.

A、household

B、houseful

C、house

D、householder

Bob is the one of the boys who ______ always punctual. (be)

A.Alice的私钥

B.Alice的公钥

C.Bob的公钥

D.Bob的私钥