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【单选题】
在数字信封中,加密信息被分为密文和信封两部分,使用()加密方法来加密文件形成密文。A.
非对称
B.
对称
C.
对称和非对称
D.
对称或非对称
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举一反三
【单选题】It’s necessary that not only ____to see a doctor but also stay at home for a good sleep. A. Bob should go B. did Bob go C. Bob’s going D. should Bob go
A.
B.
C.
D.
D
【单选题】At Spring Festival we often______ “Happy New Year” to each other.
A.
speak
B.
say
C.
tell
D.
talk
【简答题】It’s necessary that the president ________ in time to attend the meeting. A) came B) will come C) come D) comes
【单选题】why do people eat fish at spring festival?
A.
because it smeans “万事如意年年高”
B.
because we hope we can get more and more next year.
C.
because it looks like gold ingots.
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