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【单选题】
以下关于域名空间基本概念的描述中错误的是( )。A.
DNS 定义一个包括所有主机可能出现名字的域名空间
B.
DNS 必须有一个分布式数据库用来储存主机 IP 地址数据
C.
DNS 域名空间采用树状层次结构
D.
域名是由一连串可回溯的节点名组成
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【单选题】We’ll send you a copy as soon as it becomes _____. We are working on it day and night.
A.
present
B.
qualified
C.
available
D.
permanent
【单选题】to her growing business, Mary has little time to take care of her family.
A.
Devoting
B.
To devote
C.
Devoted
D.
Having devoted
【简答题】But he is having a nice time there. He has a comfortable
【单选题】In spite of increasing competition from rivals, we are _______ leading the industry in quality and customer satisfaction.
A.
besides
B.
evenly
C.
yet
D.
still
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