因不予登记的原因而终止的登记数据属于（）.A.临时状态 B.现势状态 C.历史状态

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (71) between sending the notification and notification arriving at the source thousands of additional (72) may arrive．InATMnetwork，amajortoolfor preventing (73) is (74) control. When ahostwants a new virtual (75) , it must describe the traffic to be offered and the service expected.

A．collision

B．congestion

C．drop

D．delay

  灿烂的阳光照耀着大地。一只雄鹰从它栖息的树枝上扑啦啦飞起，展翅滑翔在点缀着鲜花的田野上空。忽然，这只鸟儿停止了滑翔，它的头一动不动地停在空中，因为它发现了猎物--- 一只正在草丛中大口咀嚼着快要成熟的麦粒的田鼠。几秒之内，雄鹰俯冲而下，利爪紧紧抓住了这只田鼠，然后飞回树上享用去了。

  与此同时，一只蜘蛛正躲在附近花朵的花瓣里，一只毫无防备的蜜蜂在这朵花上停了下来，想要呷一口里面的花蜜，蜘蛛立即抓住蜜蜂，并将毒液注入蜜蜂的身体，在蜜蜂想要动用它致命的一叮之前，蜘蛛的毒液已将它毒死了。可是，不一会儿，蜘蛛却成了正在捕食蚜虫的青蛙的美餐。这一片阳光照耀的田野就是一个生态系统。请你分析这个生态系统的组成成分。

（1）请在写出这个生态系统的食物链。

（2）非生物环境有：____________。

（3）生产者有：_______________。

（4）消费者有：________________。

（5）这个生态系统中是否有分解者?

如图所示，一木板B放在水平地面上，木块A放在B的上面，A的右端通过细线、轻质弹簧秤固定在直立的墙壁上，用F向左拉动B，使它以速度v运动，稳定后，弹簧秤示数为T，求：

（1）木块A和木板B之间的摩擦力为多大？

（2）若用2F的力向左拉动B，使它向左运动，则当稳定后，弹簧秤示数为多大？

（3）通过此装置还能测量木块A和木板B之间的动摩擦因数，写出你的方法，并写出表达式．

Research at the University of Liverpool, UK, has found that Shakespeare’s language stimulates positive brain activity.

Shakespeare uses a linguistic（语言的）technique known as functional change that involves, for example, using a noun to serve as a verb．Researchers found that this technique allows the brain to understand what a word means before it understands the function of the word within a sentence．This process causes a sudden peak in brain activity and forces the brain to work backwards in order to fully understand what Shakespeare is trying to say.

Professor Philip Davis, from the university’s School of English, said: “The brain reacts to reading a phrase such as ‘he godded me’ from the tragedy of Coriolanus, in a similar way to putting a jigsaw puzzle（拼图玩具）together．If it is easy to see which pieces fit together you become bored of the game．But if the pieces don’t appear to fit, when we know they should, the brain becomes excited．By throwing irregular words into seemingly normal sentences, Shakespeare surprises the brain in a manner that produces a sudden burst of activity — a sense of drama created out of the simplest of things.”

Experts believe that this heightened brain activity may be one of the reasons why Shakespeare’s plays have such a dramatic impact on their readers.

Professor Neil Roberts, from the university’s Magnetic Resonance and Image Analysis Research Center, and Professor Davis, together with Dr Guillaune Thierry, from the University of Wales, UK, monitored 20 participants using an electroencephalogram (EEG) as they read selected lines from Shakespeare’s plays.

“The brain signal is relatively stable when we understand the meaning of a word but when the word changes the grammar of the whole sentence, brain readings suddenly peak．The brain is then forced to retrace its thinking process in order to understand what it is supposed to make of this unusual word,” explains Professor Roberts.

1．The research conducted by the professors has showed that ___________.

A．Shakespeare uses functional change to mislead readers

B．Shakespeare’s language excites positive brain activity.

C．Shakespeare’s plays have a dramatic effect on their readers.

D．Shakespeare’s language makes the brain signal relatively stable

2．Which of the following words can replace the underlined pronoun “it” in the 2nd paragraph?

A．technique           B．word          C．brain          C．sentence

3．In the 3rd paragraph, the example of a jigsaw puzzle is used here to state___________.

A．the function of Shakespeare’s linguistic technique

B．a sense of drama created by playing the game

C．the Shakespeare’s thinking process

D．the brain’s reaction to reading a book

4．Based on the research, Shakespeare’s plays have a great effect on their reader lies in_______.

A．language used in plays              B．characters showed in works

C．brain activity increased in reading     D．thinking process when writing

以下既是公民基本权利又是公民基本义务的是（）。

A.劳动

B.依法纳税

C.受教育

D.依法服兵役