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【多选题】
以下关于电子邮件系统的描述中,正确的是()。A.
所有邮件都使用标准的地址格式,并且每个邮箱命名是唯一的。
B.
所有邮件报使用统一的报文格式,从而保证不同系统之间的邮件可以交换。
C.
不标准的地址格式或专用命名空间邮件系统需要借助于路由器完成格式转换。
D.
邮件的发送接收使用统一的邮件传输协议对邮件进行传送。
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举一反三
【单选题】He _________the other students because he studies harder.
A.
has an edge on
B.
is an edge on
C.
will be an edge on
D.
sits an edge on
【简答题】But he can play football only on Saturdays or Sundays, since he has to study on the other days. But he can play football only on weekends, because he______.
【单选题】Tony has three good friends here and he has one in Beijing. [ ]
A.
another
B.
other
C.
the other
D.
others
【简答题】A．She has been to all the countries in the world. B．He wants her to recommend some places she has been to. C．She is really lucky to have traveled a lot. D．She should he a guide for a travel agency.
【单选题】He was very ______ to go, but he has no other choice.
A.
reluctant
B.
willing
C.
eager
D.
keen
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