下列( )不是计算机病毒的特征。A．传染性 B．可激发性 C．潜伏性 D．复制性

王某与张某育有二子，长子王甲，次子王乙。王甲娶妻李某，并于1995年生有一子王小甲。王甲于1999年5月遇车祸身亡。王某于2000年10月病故，留有与张某婚后修建的面积相同的房屋6间。王某过世后张某随儿媳李某生活，该6间房屋暂时由次子王乙使用。 2000年11月，王乙与曹某签订售房协议，以12万元的价格将该6间房屋卖给曹某。张某和李某知悉后表示异议，后因王乙答应取得售房款后在所有继承人间合理分配，张某和李某方表示同意。王乙遂与曹某办理了过户登记手续，曹某当即支付购房款5万元，并答应6个月后付清余款。曹某取得房屋后，又与朱某签订房屋转让协议，约定以15万元的价格将房屋卖给朱某。在双方正式办理过户登记及付款前，曹某又与钱某签订了房屋转让协议，以18万元的价格将房屋卖给钱某，并办理了过户手续。 2001年5月，曹某应向王乙支付7万元的购房余款时，曹某因生意亏损，已无支付能力。但曹某有一笔可向赵某主张的到期货款5万元，因曹某与赵某系亲戚，曹某书面表示不再要求赵某支付该货款。另查明，曹某曾于2001年4月外出时遭遇车祸受伤，肇事司机孙某系曹某好友，曹某一直未向孙某提出车祸损害的赔偿请求。 问题：

王乙与曹某签订的售房协议是否有效为什么

使用轮轴想使动力为重物重量的1/15，那么轮半径与轴半径之比是______．

患者男，21岁，因“活动后胸闷、气短1周”来诊。患者就诊时同时伴有饮食不佳。该患者40d前曾行心脏室间隔缺损修补术。查体：T36.8℃，R25次/min，P100次/min，BP120/75mmHg。心音遥远，双下肢轻度水肿。

如该患者存在大量心包积液，其形成原因首先考虑（）

A.结核感染引起

B.细菌感染引起

C.手术创伤引起

D.心力衰竭引起

E.肝功能异常引起

离心泵在运行中，电流突然下降，有可能是因为（）。

A.入口或出口堵塞

B.用户用水量加大

C.上水管线破裂

D.泵内进空气

In Africa, listening is a guiding principle .It’s a principle that’ been lost in the constant chat of the Western world .From my own past experience , I noticed how much faster I had to answer a question during a TV interview .It is as if we have completely lost the ability to listen .We talk and talk , and we end up frightened by silence .

Everywhere, people on the African continent write and tell stories. Even the nomads(流浪者)who still live in the Kalahari Desert are said to tell one another stories on their daylong wanderings, during which they search for roots and animals to hunt.

A number of years ago I sat down on a stone bench outside the Teatro Avenida in Maputo, Mozambique, where I worked as an artistic consultant. It was a hot day, and we were taking a break, hoping that a cool gentle wind would move past. Two old African men were sitting on that bench, but there was room for me, too. In Africa people share more than just water. Even when it comes to shade, people are generous.

I heard the two men talking about a third old man who had recently died. One of them said, “I was visiting him at his home. He started to tell me an amazing story about something that had happened to him when he was young. But it was a long story. Night came, and I decided that I should come back the next day to hear the rest. But when I arrived, he was dead.”

The man fell silent. I decided not to leave that bench until I heard how the other man would respond to what he’d heard. Finally he, too, spoke. “That’s not a good way to die—before you’ve told the end of your story.”

What separates us from animals is the fact that we are storytelling creatures and we can listen to other people’s dreams, fears, joys, sorrows, desires and defeats—and they in turn can listen to ours.

Many people make the mistake of confusing information with knowledge. They are not the same thing. Knowledge involves the interpretation of information. Knowledge involves listening.

Many words will be written on the wind and the sand, or end up in store. But the storytelling will go on until the last human being stops listening. Then we can send the great record of human out into the endless universe.

Who knows? Maybe someone is out there, willing to listen…

小题1:From the very beginning of the passage, we can know Europeans ________.

A．actually lose the ability to listen

B．seldom chat constantly with each other

C．feel frightened when they are alone and silent

D．tend to talk more and listen less小题2: It can be inferred from the passage that if you are in Africa, you will _______.

A．suffer hot weather and lack of water

B．be certainly helped when in trouble

C．often hear the stories told by strangers

D．have no choice but to listen during a talk小题3:According to the last three paragraphs, we can know _________.

A．no one knows exactly why Africans are willing to listen

B．information is hard to understand without interpretation

C．listening makes the difference between information and knowledge

D．the existence of humans’ recordings totally depends on the way of storytelling小题4:The passage mainly talks about __________.

A．the experience of the author

B．the art of listening in Africa

C．the importance of storytelling

D．the life styles of Africans