北大西洋冰况图上的三角形符号或表示（） A.海水结冰 B.陆源冰 C.A、B都对 D

关系模型有三类完整性约束：实体完整性、参照完整性和用户定义的完整性。定义外键实现的是哪一(些)类完整性______。

A．实体完整性

B．参照完整性

C．用户定义的完整性

D．实体完整性、参照完整性和用户定义的完整性

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

B

Most parents love the Internet and want their kids to use it. But a new survey in America finds almost as many also fear the online world—especially social networking sites such as My Space—and worry their kids will get in trouble with people they meet.

“The parents see the web’s incredible potential(可能性), and they know their kids have to be there.” says James Steyer, CEO of Common Sense Media, which released results from a survey that looked into parental attitudes toward the Internet. “It is also what they are scared of most.”

The study was conducted online May 5-10 by Insight Research Group. It says 80% of parents are concerned about kids meeting bad people online. That’s because young people who largely have grown up with the Net think of it as a social outlet(出口), say the researchers. To young people, the benefits of giving out some personal information to reach out to friends outweigh the risks. And the study shows they are so comfortable with the medium that 78% have a personal website or blog.

Parents also recognize the importance of the Internet. The survey shows 91% think the Net helps their children explore their passions, and 77% think the Internet is one of the most valuable education tools teens have. But 88% think it’s important to know what their kids are doing online.

Findings suggest both parents and teens need more education about using online media, Steyer says.

Internet safety has become an increasing concern for parents in America. Organizations like the Non-profit Common Sense have been trying to reach and help parents pay attention to the problem.

小题1: In the second paragraph, the underlined word “It” refers to_____.

A．Common Sense Media

B．the result of the survey

C．the web’s incredible potential

D．the website called My Space小题2:Why do young people give out their personal information?

A．They think it has more advantages than disadvantages.

B．They want to make themselves famous by doing that.

C．They want to have a personal website each.

D．They want to get some information from others.小题3: Most parents think it is important to know_____.

A．where their children give out the information

B．what kind of websites they have

C．how often they go online

D．what their children are doing online小题4:From the passage we can infer that_____.

A．children are too young to know how to use the Internet

B．parents must teach their children how to use the Internet

C．parents also need to learn more about using the Internet

D．the Internet is the most valuable tool for children to learn

在Excel2003中，列举两种删除工作表的方法。

不得用挖掘机铲斗（）。

A.吊运物料

B.助推机械

C.牵引机械

D.运料

无业人员赵某(男，23岁)、钱某(男，26岁)与原某国有银行分行记账员陈某(男，16岁)合谋抢银行的钱。1998年3月，陈某之父虚报陈已满18岁，将其安排到某银行工作，该分行规定陈某与其他工作人员轮流为银行提取现金。同年12月20日(陈某当时实际上仅15岁)，与赵某一同到被告人钱某家中，与钱某共同商定：利用陈某提取现金返回分行的机会，采取假抢劫方式从陈手中将银行的现金劫走。具体由钱某望风，赵某对陈某实施“暴力”，陈某佯装被劫以配合赵某的行动，事成后3人共同分赃。12月27日上午，赵、钱2人在约定地点守候，9时许，送款车停在分行门前，陈某提着装有153,000元现金的钱袋下车后故意慢行至路中间站住，被告人赵某即跑上去从陈某手中夺过钱袋，并朝陈某的后颈部猛击一拳后逃离现场，在一旁观察动静的钱某也随即离开现场。陈某佯装被抢劫，边追边喊：“抓强盗!”送款车驾驶员闻讯后，迅即驾车追赶赵、钱2人，因赵、钱拐入一狭窄僻静的小巷而未追上。陈某即到公安机关报案，称遭到抢劫。赵、钱作案后即到赵家分赃，赵分得赃款30,000元，钱分得赃款20,000元，赵另拿出20,000元供2人作外逃费用，其余83,000元(含陈某应分得的赃款)藏在陈某家中。破案后，追回赃款91,100元，其余已被挥霍一空。请回答下列问题。

如果陈某作案时已满16周岁，则其构成以下哪些犯罪( )

A．贪污罪

B．抢劫罪

C．窝藏赃物罪

D．金融诈骗罪