检验卧式镗床滑座导轨在水平面内的直线度时，在机床上或机床外与床身导轨垂直放一平尺。

下列不属于合法行为的是[ ]

①八年级学生小颖被楼上掉下来的花盆打破头，造成头部凹陷性骨折，她要求花盆的主人赔偿医药费    

②小强步行上学需过马路，他嫌走地下通道耽误时间，就每天横穿机动车快行道    

③八年级学生丁某想看看火车急刹车是什么样子，就将石块放在铁轨上    

④赵洪同学在班里特别爱捉弄人，不是在同学的椅子上放图钉，就是趁同学发言时，偷偷把椅子搬开  

A．①②③    

B．②③④    

C．①②④    

D．①②③④

Some kids can't sit still for long. They have a hard time paying attention to just one thing. They're easily distracted(分神).They can get very impatient. They hate standing in line or waiting for their turn in a game or activity. They get bored pretty fast. They may also be impulsive—saying the first thing that comes to mind or interrupting someone else who's talking.

For certain kids, this problem is so severe(严重) that doctors have a name for it: attention deficit hyperactivity disorder, or ADHD. Perhaps as many as 1 out of every 20 kids under the age of 18 have characteristics of ADHD. Often, these kids have trouble getting through school and face other difficulties later in life.

Rizzo started developing the Virtual Classroom in 1999.He wanted to see if he could use it as a tool for testing and treating kids who have attention disorders.

To diagnose(诊断) ADHD, doctors typically test patients by giving them tasks that require attention. As part of one classic test, you watch letters flashed on a computer screen. Every time you see the letter “A” followed by the letter “X”,you have to press the space bar. If you're paying close attention, you'll register all the times this combination occurs. If not, you'll miss some.

The Virtual Classroom makes these tests more efficient, Rizzo says. In one experiment, he gave a group of kids the classic “A-X” test. Instead of looking at a computer screen in a doctor's office, though, the kids wore headsets that made it look like they were taking the test in a classroom.

“Basically what we found,”Rizzo says,“is that, in 20 minutes of testing with virtual reality,we replicated(复制) a finding that usually requires a couple hours of standard testing with computer screens in the psychologist's office.”

小题1:The first paragraph mainly tells us _______.

A．how to find a patient with ADHD

B．the behavior of some kids with ADHD

C．kids with ADHD cannot sit still for a long time

D．kids with ADHD are easily distracted小题2: Perhaps as many as _______ kids have characteristics of ADHD. 

A. one out of every twenty kids

B. five percent kids less than 18 years old

C. one out of twenty kids at the age of 18

D. five percent kids more than age of 18

小题3: In the experiment, patients need to press the space bar, when _______.

A．see letters A following X

B．first see A then see B

C．see letter X and A

D．see letters A followed by X小题4:The main idea of the last paragraph is _______.

A．in virtual classroom, we finish the test in 20 minutes

B．the standard test with computer screen usually costs several hours

C．the experiment is easy to do

D．the result of the experiment

关于 * * 检查，除哪项外，都是正确的（）。

A.触痛提示炎症或囊性病变

B.一个硬的无痛性不规则小结节是癌肿的特征

C.脂肪坏死可产生 * * 变形或内陷

D. * * 内陷是异常的表现

E.多发性结节提示良性囊性病变

Windows 98提供的Windows Media Player是一个功能强大的多媒体释放软件，可以从Microsoft有关网站不断升级。该软件目前不能释放下列哪种类型的音视频文件？

A．ASF

B．RM

C．MPG

D．AVI

18岁，女患者，半年来，右侧下后牙经常胀痛。检查见体完整无龋，X线片示根尖孔未发育完成，牙龈瘘管

还应做哪项检查帮助确诊（）

A．视诊

B．叩诊

C．咬诊

D．X线片检查

E．电测试