Wanger-Nelson法(简称W-N法)是一个非常有名的方法，它主要是用来计算下

确定土地所有权的历史沿革所包括的内容不包括( )。

A．确立了农民土地私有制和国家土地所有制

B．初步确立集体土地所有权制度

C．巩固集体土地“三级所有、队为基础”的所有权制度

D．确定土地所有权应注意的问题

滑动摩擦力在研究相关物体运动情况时起着重要的作用。通过实验探究已经知道滑动摩擦力与接触面积的粗糙程度有关，也与接触面之间的压力有关。有些同学猜想滑动摩擦力可能还与接触面的大小有关。请你从以下器材中选出部分器材，设计一个实验对此猜想进行检验。

器材：a.斜面 b.带钩的立方体木块 c. 带钩的长方体木块 d.表面平整的长木板 e.几条毛巾 f.直尺 g.弹簧测力计 h.硬纸板。

（1）你所需要的实验器材（用器材前面的字母表示）

（2）简述主要的实验步骤：

自然解冻的优点是风味保持的最佳，缺点是（）。

A、解冻时间长

B、成本比较高

C、不宜保存

D、色泽容易变化

30岁已婚妇女，停经48天，剧烈腹痛2天， * * 不规则流血1天，今晨从 * * 排出三角形膜样组织，检查贫血外貌，下腹部压痛、反跳痛明显。正确治疗措施应选择

A．立即行刮宫术
B．静脉滴注缩宫素
C．肌注麦角新碱
D．行剖腹探查术
E．应用止血药

In an age of perpetual digital connectedness, why do people seem so disconnected In a Duke University study, researchers found that from 1985 to 2004, the percentage of people who said there was no one with whom they discussed important matters tripled, to 25%; the same study found that overall, Americans had one-third fewer friends and confidants than they did two decades ago.

Another recent study, by researchers at the University of Michigan, found that college students today have significantly less empathy than students of generations past did. The reason, psychologists speculate, may have something to do with our increasing reliance on digital communication and other forms of new media.

It’s possible that instead of fostering real friendships off-line, e-mail and social networking may take the place of them—and the distance inherent in screen-only interactions may breed feelings of isolation or a tendency to care less about other people. After all, if you don’t feel like dealing with a friend’s problem online, all you have to do is log off.

The problem is, as empathy wanes, so does trust. And without trust, you can’t have a cohesive society. Consider the findings of a new study co-authored by Kevin Rockmann of George Mason University and Gregory Northcraft at the University of Illinois who specializes in workplace collaboration. Northcraft says high-tech communications like e-mail and (to a lesser extent) videoconferencing—which are sometimes known as "lean communication" because they have fewer cues like eye contact and posture for people to rely on—strip away the personal interaction needed to breed trust. In a business setting—as in all other social relationships outside the workplace—trust is a necessary condition for effective cooperation within a group. "Technology has made us much more efficient but much less effective," said Northcraft in a statement. "Something is being gained, but something is being lost. The something gained is time, and the something lost is the quality of relationships. And quality of relationships matters."

In Rockmann and Northcraft’s study, 200 students were divided into teams and asked to manage two complicated projects: one having to do with nuclear disarmament; the other, price fixing. Some groups communicated via e-mail, some via videoconference and others face to face. In the end, those who met in person showed the most trust and most effective cooperation; those using e-mail were the least able to work together and get the job done.

Northcraft thinks this is because real-life meetings, during which participants can see how engaged their colleagues are, breed more trust. Over e-mail, meanwhile, confirmation of hard work gets lost, which tends to encourage mutual slacking off.

Which of the following could best summarize the passage（）

A. Digital communication is hurting personal relationship

B. Online networking may take the place of offline relationship

C. New media contribute less to fostering real friendship

D. Real-life meetings can breed trust among students