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【单选题】
Which of the following is true of a VPN (virtual private network)?A.
A VPN communication is secure even though it is transmitted over the public Internet.
B.
One disadvantage of a VPN is that it does not encrypt messages.
C.
Remote access is difficult in case of a VPN.
D.
It is a physical, private pathway over a public or shared network from the client to the server.
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【简答题】一般来说，综合式液力变矩器比普通液力变矩器的（）。
【简答题】Students must have the chance to use good resources.
【单选题】________ by a college or university in the USA Chinese students must have excellent speaking and writing abilities in English.
A.
To be accepted
B.
Being accepted
C.
Having been accepted
D.
Accepted