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【单选题】
● 3DES在DES的基础上，使用两个56位的密钥K1和K2，发送K1加密，K2解密，再用K1加密。接受K1解密，K2加密，再用K1解密，这相当于使用___(12)___倍于DES的密钥长度的加密效果。 （12）A.
1
B.
2
C.
3
D.
6
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举一反三
【单选题】Charlie believed that cinema was only a passing fad and it would sooner or later disappear.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】She is quite fashionable and she only buys things that are______.
A.
out of style
B.
on the style
C.
in style
D.
off style
【单选题】After singing a song, he __ us a joke.
A.
went on telling
B.
went on to tell
C.
went telling
D.
went to tell
【简答题】Tell a joke at the beginning to relax the atmosphere. _________
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