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【单选题】
以下关于分类汇总的说法正确的是______。A.
不能对文本型的数据进行汇总
B.
分类汇总前需要按分类的列排序，然后再汇总结果
C.
分类汇总前需要按分类的列筛选，然后再汇总结果
D.
分类汇总可以对日期型数据汇总求和
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【简答题】IPv6地址的格式前缀（FP）用于表示（ ）。为实现IP地址的自动配置，IPv6主机将（ ）附加在地址前缀1111 1110 10之后，产生一个链路本地地址，如果通过了邻居发现协议的验证，则表明自我配置的链路本地地址是有效的。 A.地区号 B.地址类型或子网地址 C.网络类型 D.播送方式或子网号 A.32位二进制随机数 B.主机名字 C.网卡MAC地址 D.IPv4地址
【单选题】The writer felt foolish because ______.
A.
he couldn' t really lost his receipt
B.
he hadn' t really lost his receipt at all
C.
he had to fill in a form
D.
the assistant was laughing at him
【单选题】What seems to be the man' s problem?
A.
He can' t sleep at night.
B.
He can' t find a quiet place to study.
C.
He can' t narrow down his research topic.
D.
He can' t find enough information for his research paper.
【单选题】What does the man want to know?
A.
He doesn' t want to read what she wrote.
B.
He hasn' t started the assignment.
C.
He has read some of the articles.
D.
He' ll summarize what he has read.
【简答题】青春期常见的卫生问题有几种?
【单选题】Why didn' t the man get the job?
A.
He doesn' t write well enough.
B.
He is not a professional writer.
C.
He hasn' t got any professional experience.
D.
He doesn' t perform. well in the interview.
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