下面给出关于关系模型的说法中，( )是不正确的。 Ⅰ．任何一张二维表都是一个关系

在宏观、微观和符号之间建立联系是化学学习的特点。

（1）上图中A是_____。

（2）在铜、氯化钠、二氧化碳三种物质中，由分子构成的是______。

（3）葡萄糖酸钙【化学式为(C₆H₁₁O₇)₂Ca】由______种元素组成，其中碳、氢元素的质量比为     。

（4）下图为某反应的微观示意图。

① 该反应中B与D的质量比是______（结果用最简整数比表示）。

② 对此反应的叙述正确的是______（填序号）。

a．反应前后各元素化合价均未改变      b．用同种元素可以组成不同物质

c．加入催化剂可提高产物质量         d．利用此反应可减少有毒气体的排放

抵押贷款的风险包括( )。

A．无力继续偿还贷款本息风险

B．房屋贬值风险

C．利率变化风险

D．购房者房屋处置风险

E．银行管理风险

肝硬化的并发症是（）

A.肝性脑病

B.上消化道出血

C.肝肾综合征

D.肝肺综合征

E.肝癌

阅读理解。

     It is well-known that many people look for a new job through newspaper advertisements and the

Internet, which are great ways. However, job fairs (招聘会) may open up more doors for you and allow

you to build a sound future career(事业).

     A job fair allows many companies from your area, as well as other areas to gather together to recruit

suitable people to help the development of their business. These companies typically attend the job fairs

to accept new people into their team.

     Take Cumberland in Maryland as an example, the job fair is held at the Holiday Inn's large

meetingroom, which is next to the main hall. Dates change but the event lasts from 8 am until 6 pm throughout the whole week. The job fair is usually held several times every year; dates can be found in the

Cumberland Times News or on the newspaper's website. Also, information about the companies that will be attending, is offered, along with these companies' web addresses for you, so that you can make more

preparations based on the needs of the companies you are interested in.

     You must know that you can't show all of your talents, skills and abilities on a resume (简历) alone, so

it's important to leave a good and lasting impression in employers' minds in a very short time. So you must make sure that you have given your best to the employers. Get a handshake with all of the employers you

speak to and, introduce yourself clearly enough so that they will remember you in case you get an interview in the near future. Seldom, people are employed on these job fairs for the qualifications (资格证书) they

show.

     You should take with you at least 20 copies of your resume. Prepare a notebook and a pen to write

down what is told you by the employers. This shows your interest and willingness to learn.

1. In the author's opinion ,     .

A. people don't realize the advantages of attending job fairs

B. job fairs provide more chances than other ways

C. the companies that attend job fairs all come from an area  

D. the more resumes people bring, the better jobs they will find

2. What does the underlined word "recruit" in Paragraph 2 probably mean?

A. Get someone as a new member.              

B. Give somebody some information

C. Put forward some new opinions.              

D. Attend an important meeting.

3. The companies' web addresses are provided to      .

A. make people send their resumes online  

B. help people know more about the companies.

C. make people get the tickets for the job fairs  

D. make the companies known by more people

4. What should be paid attention to when you're in the job fair?

A. Make friends with the employers.

B. Showing the willingness to learn to the employers.

C. Performing your best to the employers.

D. Showing your qualifications to the employers.  

5. What can be learned from the passage?

A. Most people can get a satisfying job in a job fair.

B. Finding jobs through the Internet isn't useful at all.

C. Job fairs of Cumberland are held on specific dates

D. Qualifications are not very important in job fairs

凫水fú shuǐ