关于科索布金幽默漫画的特点，下列说法正确的是（）。A、改变事物的特质而进行创作B

阅读理解。

     Millions of young people are writing blogs. Millions of others are reading them. The word "blog" is a

short way of saying Web log.

     Many popular Web sites now offer free, easy ways to create personal Web pages and fill them with

writings and pictures. Web sites called "Facebook" and "MySpace" are some of the most popular blog sites

for young people. Many young adults use their blogs to write about daily activities and events in their lives.

They also provide a place for people to write their ideas and opinions and how they think of others' ideas.

     Blogs offer young people a place to show their writings and feelings. They can also be helpful to connect*

young people with others. But blogs can become dangerous when they are read on the Internet by millions of

people all over the world.

     Recent studies show that young people often provide their names, age and where they live on the Internet.

That may not be safe for them. This personal information puts them at risk* of being searched out by

dangerous people who want to hurt them. Many students do not know about privacy* and are surprised to

learn that adults can read their personal daily records easily. Students can also get into trouble when they put

information about others on their blogs.

     As a result, many schools have banned* the use of blogging web sites on school computers. Many

schools have also begun teaching parents about the web sites. Parents should know what their children are

doing online and should read their blogs to make sure they are not giving out private information. One way to

keep away from these problems is to use programs so that blogs can be read by"friends only." people can

read the website only if they know a secret word chosen by the blogger.

1. "Facebook" and "MySpace" are ________.

A. school subjects

B. computer programmes

C. School online BBS

D. blog sites for young people

2. Blogs may be dangerous because ________.

A. they get in the way of studies

B. they are not allowed for school students

C. surfing the Internet is bad for eyes

D. personal information can be found in blogs easily

3. This passage is mainly about _________.

A. the safety of children's blogs

B. how to search the internet

C. students' behavior at school

D. communicating with parents at home

4. According to the passage, many schools help children avoid blog problems

    by doing everything EXCEPT ________.

A. teaching parents about the web sites

B. asking students to use programs to refuse strangers

C. telling school students not to make any net friends

D. stopping students from blogging on school computers

5. You can enjoy your blog safely if ________.

A. you write your blog at school

B. use a secret number for friends to enter your blog

C. your parents have little knowledge about websites

D. you show all your writings and feelings in your blog

下列哪些节日的由来与中国近现代史上发生的重大事件有关

①端午节②青年节③建军节④国庆节  [ ]

A、①②③

B、②③④

C、①③④

D、①②④

发动机在冷态时不要放机油。（）

什么是建档立卡“五清”？

阅读以下说明和图，回答问题1至问题4，将解答填入对应栏内。

[说明]

某高校欲开发一个成绩管理系统，记录并管理所有选修课程的学生的平时成绩和考试成绩，其主要功能描述如下：

(1)每门课程都由3～6个单元构成，每个单元结束后会进行一次测试，其成绩作为这门课程的平时成绩。课程结束后进行期末考试，其成绩作为这门课程的考试成绩。

(2)学生的平时成绩和考试成绩均由每门课程的主讲教师上传给成绩管理系统。

(3)在记录学生成绩之前，系统需要验证这些成绩是否有效。首先，根据学生信息文件来确认该学生是否选修这门课程，若没有，那么这些成绩是无效的；如果选修了这门课程，再根据课程信息文件和课程单元信息文件来验证平时成绩是否与这门课程所包含的单元相对应，如果对应，那么这些成绩是有效的，否则无效。

(4)对于有效成绩，系统将其保存在课程成绩文件中；对于无效成绩，系统会单独将其保存在无效成绩文件中，并将详细情况提交给教务处。在教务处没有给出具体处理意见之前，系统不会处理这些成绩。

(5)若一门课程的所有有效的平时成绩和考试成绩都已经被系统记录，系统会发送课程完成通知给教务处，告知该门课程的成绩已经齐全。教务处根据需要，请求系统生成相应的成绩列表，用来提交考试委员会审查。

(6)在生成成绩列表之前，系统会生成一份成绩报告给主讲教师，以便核对是否存在错误。主讲教师需将核对之后的成绩报告返还系统。

(7)根据主讲教师核对后的成绩报告，系统生成相应的成绩列表，递交考试委员会进行审查。考试委员会在审查之后，上交一份成绩审查结果给系统。对于所有通过审查的成绩，系统将会生成最终的成绩单，并通知每个选课学生。

现采用结构化方法对这个系统进行分析与设计，得到如图15-13所示的顶层数据流图和如图15-14所示的第0层数据流图。

使用说明中的词语，给出图15-13中的外部实体E1～E4的名称。