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【单选题】
Which component of VPN technology ensures that data can be read only by its intended recipient？（）A.
data integrity
B.
encryption
C.
key exchange
D.
authentication
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反馈参考答案：
举一反三
【简答题】___ snacky online content
【单选题】The result of the online experiment is that the people involved ______.
A.
improved their cognitive function
B.
did not increase their skills in s
C.
increased the skills in playing s but did not improve IQ
D.
had no improvement in playing s and intelce tests
【单选题】贝多芬《第六交响曲》又称( ),这部作品比较具有描述性,在乐曲中甚至可以听出鸟鸣和流水声等。
A.
《欢乐颂》
B.
《英雄交响曲》
C.
《田园交响曲》
D.
《命运交响曲》
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