孕产妇死亡率的分母为A．人口总数 B．女性人口数 C．育龄妇女数 D．年平均人口数

沟通有三大要素包括有一个明确的（）；达成（）；沟通信息、（）。

为了最大限度地减少逆选择，合格员工能够得到的团体寿险的保额通常是由某一体系确定的，员工不能自由选择。下列哪一项因素不是用来确定团体保障的保额（）。

A.适用于个别员工的某一固定金额

B.员工报酬的函数

C.员工职位的函数

D.员工服务期限的函数

某探究学习小组的同学欲验证“动能定理”，他们在实验室组装了一套如图所示的装置。

① 实验中所用电磁打点计时器是一种使用__________（填 “交流”或 “直流”）电源的计时仪器，它的工作电压是4-6V，当电源的频率为50Hz时，它每隔_______s打一次点。

② 实验时为了保证滑块受到的合力与沙桶的总重力大小基本相等，沙和沙桶的总质量应满足的实验条件是__           _______               ___，实验时首先要做的步骤是_________________。

③ 在②的基础上，某同学用天平称量滑块的质量为M；往沙桶中装入适量的细沙，用天平称出此时沙和沙桶的总质量为m；让沙桶带动滑块加速运动。用打点计时器记录其运动情况，在打点计时器打出的纸带上取两点，测出这两点的间距L和这两点的速度大小v₁与v₂(v₁＜v₂)。则本实验最终要验证的数学表达式为_________________。(用题中的字母表示实验中测量得到的物理量)

阅读理解。

     Newspapers in the United States earn most of their money from selling space for advertising. The

rates they charge are tied to the number of readers. But the number of people who buy newspapers has

been falling for years. And this traditional business model had not worked very well on the Internet,

especially in a bad economy.

     Many newspaper companies have large debts from buying other papers. Some papers have recently

closed or declared bankruptcy or reduced their operations.

     Newspapers are looking for new ways to reinvent themselves and new ways to earn money. That

includes giving new consideration to an old idea-charging for at least some of the material that most

papers now publish online for free.

     Internet access to newspapers means that more people may read the news, which is good for society. But good reporting costs money. The question is how much people are willing to pay for news that they

have got used to receiving for free.

     The look of American newspapers changed after USA Today arrived in 1982. Most of the stories

were short. There was heavy use of color and images. People who compared it to television did not

necessarily mean that as praise. But the new design succeeded and influenced many other papers.

     Now newspapers are looking to redesign themselves for an increasingly online world. Millions of

people would rather read papers like USA Today and The New York Times for free on the Web than

pay for a printed version. Publishers who chose that business plan might regret it now, but they might

not have had much choice. Survival means changing as conditions change. Like any other business,

newspapers have to balance their needs with the need of their customers.

1. American newspapers earn most money from_______.

A. advertising products  

B. selling newspapers      

C. publishing stories    

D. reporting news

2. Which of the following statements about USA Today is NOT true?

A. It had short stories.                    

B. There were many images.

C. There was heavy use of color.            

D. It was published before 1982.

3. The main cause of the problems of American newspapers is that _______.

A. too many people read printed newspapers for free

B. the Internet and television have taken the place of newspapers

C. some newspapers have become non-profit organizations

D. more and more people read news on the Web

4. The underlined words "that business plan" in the last paragraph refer to _______.

A. declaring bankruptcy                  

B. changing the look of newspapers

C. publishing news on the Internet          

D. Providing readers with printed versions for free

5. What is the main idea of the passage?

A. Advertising industry in America is going through some changes.

B. Great changes have taken place in the American media.

C. American newspapers will have a bright future.

D. American newspapers are facing great difficulties.

大血藤的断面特征为（）

A.横断面皮部呈红棕色，有数处向内嵌入木部

B.髓小，偏向一侧

C.形成层环多角形

D.韧皮部有树脂状分泌物，与木部相见排列呈数个同心性半圆形环

E.皮部厚，有棕色油点