【单选题】【消耗次数：1】
Alice收到Bob发给他的一个文件的签名，并要验证这个签名的有效性，那么签名验证算法需要Alice选用的密钥是（ ）
①
Alice的公钥
②
Alice的私钥
③
Bob的公钥
④
Bob的私钥
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【单选题】
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应该选用哪种密钥对邮件加密？
①
Alice的公钥
②
Alice的私钥
③
Bob的公钥
④
Bob的私钥
【单选题】
He ________ Alice for ten years.
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married to
②
has married to
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has married
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has been married to
【单选题】
Alice rudely showed me the door.
①
A.爱丽斯无礼地向我指了一下门的位置。
②
B.爱丽斯无礼地让我看了看她的门。
③
C.爱丽斯无礼地把我送到门口。
④
D.爱丽斯无礼地把我轰出了门。
【单选题】
Alice is a __________ person and never makes any unreasonable demands.
①
sensible
②
sensitive
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severe
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solemn
【单选题】
Alice: Natalie must have left since your plane arrived so late.Sam: To my surprise, I found her waiting for me at the airport.Alice: ___________
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What a pity.
②
How kind.
③
Good for her.
④
No kidding.
【单选题】
Alice: Natalie must have left since your plane arrived so late. Sam: To my surprise, I found her waiting for me at the airport. Alice: ___________
①
What a pity.
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How kind.
③
Good for her.
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No kidding.
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