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【多选题】
下列有关数据加密技术的说法,正确的是( )A.
数据加密技术就是通过信息的变换编码，使授权用户能够接收到正确的信息，而非法用户无法接收到正确信息的方法
B.
加密过程就是将原始信息重新组织、变换成难以识别的编码的过程
C.
解密过程就是对经过逆变换还原成原始信息的过程
D.
数据加密技术分为非对称加密和公开密匙加密
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【简答题】what is the WTO 's key role?what other roles does it play?
【单选题】I’ve lived here for about _______.
A.
two and a half year
B.
two and a half years
C.
two year and a half
D.
two years and half
【单选题】听力原文： In the 1940's and 1950's, it was not likely that a young black teenager from New York's Harlem would ever have the chance to play in the world's biggest tennis tournaments. But Althea Gibson did...
A.
New York City.
B.
Harlem.
C.
Silver, South Carolina.
D.
California.
【单选题】—I have ____ here for two months. —So you ____ here since two months ago. [ ]
A.
come, came
B.
been, have been
C.
been, come
D.
come, have been
【简答题】_______'s play________________successfully portrays the Wingfields as a family of escapists who are indulged in their own illusory worlds.
【单选题】The town is about _________ ride from here.
A.
two hour
B.
two hour's
C.
two hours'
D.
two-hours
【单选题】The idea of opening a new cinema here was not wise, as there are two here already, _________ usually half-empty.
A.
neither
B.
none
C.
either
D.
both
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