6KV验电器支持部分交流耐压试验标准是（）KV。A、6 B、10 C、30 D、40

阅读理解。

     Social networking websites are causing alarming changes in the brains of young users, a famous scientist

has warned. Sites such as Facebook, Twitter and Bebo are said to shorten attention spans (幅度), encourage

instant satisfaction and make children more self-centered.

     Warnings from neuroscientist (神经系统科学家) Susan Greenfield will disturb the millions whose social

lives depend on surfing their favorite websites each day. But they will strike a chord (弦) with parents and

teachers who complain that many teenagers lack the ability to communicate or concentrate away from their

screens.

     More than 150 million use Facebook to keep in touch with friends, share photographs and videos and

post regular updates of their movements and thoughts. A further six million have signed up to Twitter, the

"micro-blogging" service that lets users exchange text messages about themselves. But while the sites are

popular and extremely profitable, a growing number of psychologists and neuroscientists believe they may

be doing more harm than good.

     Baroness Tarot, an Oxford University neuroscientist believes repeated exposure could rewire the brain.

Computer games and fast-paced TV shows were also a factor, she said. "My fear is that these technologies

are weakening the brain to the state of small children who are attracted by buzzing noises and bright lights,

who have a small attention span and live for the moment. often wonder whether real conversation in real

time may eventually give way to these easier and faster screen dialogues, in much the same way as killing

and butchering an animal to eat has been replaced by the convenience of packages on the supermarket shelf,"

she said.

     Psychologists have also argued that digital technology is changing the way we think. They point out that

students no longer need to plan their term papers before starting to write-thanks to word processors they

can edit as they go along.

     A study by the Broadcaster Audience Board found teenagers now spend seven and a half hours a day in

front of a screen. Educational psychologist Jane Healy believes children should be kept away from computer

games until they are seven. Most games only excite the "flight or fight" areas of the brain, rather than the

areas responsible reasoning.

     Sue Palmer, author of Toxic Childhood, said:"We are seeing children's brain development damaged because

they don't engage in the activity they have engaged in for thousands of years. I'm not against technology and

computers. But before they start social networking, they need to learn to make real relationships with people."

1. According to the passage, social networking websites might _____.

A. encourage young users constant satisfaction

B. lengthen young users' attention span

C. make young users more selfish

D. help young users communicate better with their families

2. A neuroscientist may worry that sites like Facebook may _____.

A. help children learn to make real relationships with people in society

B. encourage students not to plan their term papers before starting to write

C. disturb those whose social lives depend on surfing their favorite websites

D. make real conversation in real time give way to easier and faster screen dialogue

3. From the passage we can infer that _____.

A. Baroness Tarot agrees websites cause small children's small attention span

B. Jane Healy believes computer games can do good to children's reasoning

C. Susan Greenfield's warnings have been brought to wide public attention

D. Sue Palmer's book Toxic Childhood discusses the development of networking

4. What is the purpose of this passage?

A. To tell us the conflict between neuroscientists and psychologists on websites.

B. To present some negative opinions on social networking websites.

C. To offer advice on the problem of brain damage caused by social networking.

D. To analyse how social networking websites cause damage in the brains of teenagers.

5. From Baroness Tarot's example of "killing and butchering an animal to eat", we can learn he is worried

    that _____.

A. technologies are weakening are the brain to the state of small children

B. small children have a small attention span and live for the moment

C. real conversation in real time may be replaced by easier and faster screen dialogues

D. killing and butchering an animal to eat leads to the convenience of the supermarket

以下关于肾结石的声像图表现不正确的是（）

A.多为强回声光团

B.常伴有声影

C.可以伴有肾积水

D.随患者体位改变而移动

E.位于肾窦内

特邀监督员的职权有( )。

A．根据工作需要可以向公安机关了解公安工作及队伍建设的有关规定

B．可以向公安机关和公安民警了解所反映和转递的检举、控告和建议、意见等事项的办理情况

C．在履行监督职责过程中，有权要求有关公安机关和公安民警予以协助、配合，并答复质询

D．对各级公安机关和公安民警履行职责、执法执勤和遵纪守法等情况实施监督

女，3岁。出生后发现患儿头颈部歪斜，并逐渐加重，现头部明显倾向右前方，面部旋向左侧，右侧胸锁乳突肌紧张，触之如索状。

如需手术治疗，应选择的方式是（）。

A.开放复位术

B.病灶清除术

C.神经探查术

D.肌腱切断松解术

E.血管吻合术

某新建项目，建设期为3年，第1年初投入300万元，第2年初投入400万元，第3年初投入300万元。3年后投入运营，预计每年可获得年收入120万元，当年生产经营费用为20万元，若在以后各年中的年收入与年经营费用保持不变，运营15年后该项目无偿转交给政府。

投资回收期可以表明收回投资需要的时间，但该指标也有不足之处，主要体现在______。

A．不能全面反映项目在整个寿命周期内的真实收益

B．不能进行多方案比较

C．静态投资回收期比动态投资回收期小

D．使用静态指标会影响项目决策的科学性