一般（）在输水过程中沿程无流量变化。A、取水管 B、送水管 C、配水管 D、输水管（

俗话说，国有国法，家有家规。亚太经济合作组织（APEC）不是“共同体”性质的，但作为亚太地区的一个“大家庭”，需要有一种“大家庭精神”。这种“大家庭精神”就是在实践中逐步形成的“APEC方式”，它对保证APEC大家庭的和睦与健康发展起着决定性的作用。实践证明：只要坚持按照“APEC方式”深化“大家庭精神”和处理问题，不论是在贸易投资自由化领域还是经济技术合作领域，事情都进展得比较顺利；反之，一旦偏离“APEC方式”，矛盾马上凸显，问题也不好解决。APEC领导人第十五次非正式会议于2007年9月8日在澳大利亚悉尼召开，这次会议的主题是“加强大家庭建设，共创可持续未来”。人们热切期待APEC成员按照“APEC方式”进一步升华“大家庭精神”，体现新世纪对和平与发展的时代呼唤。

简述独特的APEC方式的内容和作用。

The word “sharp” can be _1_ to describe many different things in your home, classroom, and places of work. In this chapter, the writer _2_sharp pencils, meaning pencils with a very fine _3_.The writer does not like dull pencils.

We can also use “sharp” to describe the blades of knives. Knives also have points. We can use “sharp” to describe a _4_ kind of point,_5_as the sharp points of kitchen and steak knives. Scissors have blades, too, and we can describe these blades as sharp or dull. Furthermore, the points of scissors are _6_ sharp or rounded _7_ on the kind of scissors. Some tools, such as saws, scrapers, and garden tools, also have blades. We can use the words “sharp” and “dull” to describe the blades of these tools, _8_.Sharp knives, scissors, and tools are_9_to use. They cut things easily and quickly, without effort.

“Sharp” can be used to describe the edges of furniture and _10_some containers. For example, the edge of a table or desk can be _11_.In addition; we can describe the edge of _12_ open can as sharp. The top of a can is sometimes sharp_13_ to cut your hand. A piece of _14_ from a broken jar or bottle is_15_very sharp.

_16_we sometimes use “sharp” to describe people. A person who appears sharp is very well _17_.A person who is sharp, on the other hand, is intelligent, smart, and_18_ learn and understand.

To summaries, “sharp” can be used to describe many kinds of _19_ that have blades, points, and edges. When we used it to describe people, it can mean nice looking, well dressed, or intelligent. It is an expensive word _20_ it can be used in many different ways.

1. A. written         B. used         C. seen           D. taken

2. A. talks about                      B. takes care of

C. doesn't like to mention            D. makes up his mind to

3. A. sharp          B. color         C. point          D. edge

4.  A. some         B. any          C. only           D. certain

5. A. so           B. as soon         C. such           D. or

6. A. either        B. neither          C. too            D. very

7. A. working      B. which are       C. is             D. spending

8. A. too          B. even           C. either          D. ever

9. A. difficult      B. easy            C. interesting      D. clean

10. A. for         B. with            C. of             D. at

11. A. seen        B. sharp           C. smooth         D. hard

12. A. an          B. a              C. the             D.\

13. A. so as        B. in order        C. so that          D. enough

14. A. news        B. glass          C. information      D. advice

15. A. again        B. quite          C. rather           D. ordinarily

16. A. However     B. Finally        C. Therefore        D. In this way

17. A. prepared     B. dressed        C. mannered        D. served

18. A. easy to      B .is to           C. to              D. quick to

19 .A. funny things  B. knives        C. objects          D. containers

20. A. because      B. even if        C. though          D. not only

关系模型的完整性规则是对关系的某种约束条件，包括实体完整性、______和自定义完整性。

自变量的混淆

十八届四中全会决定的精髓是（）。

A.科学立法，严格执法

B.公正司法，违法必究

C.有法可依，有法必依

D.依宪治国，依宪执政