副翼系统输入移动扰流板混合器连杆操作飞行扰流板（）A、不同方向一边向上一边向下 B、相

如图所示，固定于同一条竖直线上的A、B是两个带等量异种电荷的点电荷，电荷量分别为+Q和-Q，A、B相距为2d．MN是竖直放置的光滑绝缘细杆，另有一个穿过细杆的可视为点电荷的带电小球，质量为m、电荷量为+q，（此电荷不影响电场的分布．），现将小球从与点电荷A等高的C处由静止开始释放，小球向下运动到O点时速度为v，已知CO=d，MN与AB之间的距离为d，静电力常量为k，重力加速度为g．

求：

（1）C、O间的电势差U；

（2）O点处的电场强度E的大小；

（3）小球经过与点电荷B等高的D点时的速度．

对胆总管囊肿描述错误的是 （ ）

A．胆总管局限性扩张

B．胆总管瘤样扩张

C．胆总管局部梭形扩张

D．肝外胆管一致性轻度扩张

E．胆总管瘤样扩张，近端胆管不扩张并与其相连

影响口服缓控释制剂的设计的理化因素不包括（）

A.稳定性

B.水溶性

C.油水分配系数

D.生物半衰期

E.pK_a、解离度

Addiction is such a harmful behavior, in fact, that evolution should have long ago weeded it out of the population: if it’s hard to drive safely under the influence, imagine trying to run from a saber-toothed tiger or catch a squirrel for lunch. And yet, says Dr. Nora Volkow, director of NIDA and a pioneer in the use of imaging to understand addiction, "the use of drugs has been recorded since the beginning of civilization. Humans in my view will always want to experiment with things to make them feel good. "

That’s because drugs of abuse co-opt the very brain functions that allowed our distant ancestors to survive in a hostile world. Our minds are programmed to pay extra attention to what neurologists call salience--that is, special relevance. Threats, for example, are highly salient, which is why we instinctively try to get away from them. But so are food and sex because they help the individual and the species survive. Drugs of abuse capitalize on this ready-made programming. When exposed to drugs, our memory systems, reward circuits, decision-making skills and conditioning kick in--salience in overdrive--to create an all consuming pattern of uncontrollable craving. "Some people have a genetic predisposition to addiction," says Volkow. "But because it involves these basic brain functions, everyone will become an addict if sufficiently exposed to drugs or alcohol. "

That can go for nonchemical addictions as well. Behaviors, from gambling to shopping to sex, may start out as habits but slide into addictions. Sometimes there might be a behavior-specific root of the problem. Volkow’s research group, for example, has shown that pathologically obese people who are compulsive eaters exhibit hyperactivity in the areas of the brain that process food stimuli--including the mouth, lips and tongue. For them, activating these regions is like opening the floodgates to the pleasure center. Almost anything deeply enjoyable can turn into an addiction, though.

Of course, not everyone becomes an addict. That’s because we have other, more analytical regions that can evaluate consequences and override mere pleasure seeking. Brain imaging is showing exactly how that happens. Paulus, for example, looked at drug addicts enrolled in a VA hospital’s intensive four-week rehabilitation program. Those who were more likely to relapse in the first year after completing the program were also less able to complete tasks involving cognitive skills and less able to adjust to new rules quickly. This suggested that those patients might also be less adept at using analytical areas of the brain while performing decision-making tasks. Sure enough, brain scans showed that there were reduced levels of activation in the prefrontal cortex, where rational thought can override impulsive behavior. It’s impossible to say if the drugs might have damaged these abilities in the relapsers--an effect rather than a cause of the chemical abuse--but the fact that the cognitive deficit existed in only some of the drug users suggests that there was something innate that was unique to them. To his surprise, Paulus found that 80% to 90% of the time, he could accurately predict who would relapse within a year simply by examining the scans.

Another area of focus for researchers involves the brain’s reward system, powered largely by the neurotransmitter dopamine. Investigators are looking specifically at the family of dopamine receptors that populate nerve cells and bind to the compound. The hope is that if you can reduce the effect Of the brain chemical that carries the pleasurable signal, you can loosen the drug’s hold.

Paulus could accurately predict the relapsers because（）

A. the part of their brain controlling cognitive skills is less active

B. a four-week intensive rehabilitation program is not effective enough

C. he has the devices sophisticated enough to scan any brain damage

D. something innate to their brains prompt them to use drugs

每局比赛中，每队可以请求（）次普通暂停。

A.2

B.3

C.4

D.6