Everyone has got two personalities—the one that is shown to the world and the other that is secret and real. You don't show your secret personality when you're awake because you can control your behavior, but when you're asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their position. The important position is the one that you go to sleep in.?

If you go to sleep on your back, you're a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don't like to upset people, so you never express your real feelings. You're quite shy and you aren't very confident.

If you sleep on your stomach, you are a rather secretive person. You worry a lot and you're always easily upset. You're very stubborn(顽固的),but you aren't very ambitious. You usually live for today not for tomorrow. This means that you enjoy having a good time.?

If you sleep on curled up, you are probably a very nervous person. You have a low opinion of yourself and so you're often defensive. You're shy and you don't normally like meeting people. You prefer to be on your own. You're easily hurt.

If you sleep on your side, you have usually got a well?balanced personality. You know your strengths and weakness. You're usually careful. You have a confident personality. You sometimes feel anxious, but you don't often get depressed. You always say what you think even if it annoys people.?

According to the writer, you naturally show your secret and real personality _______.

A. only in a normal night?

B. only when you go to sleep?

C. only when you refuse to show yourself to the world?

D. only when you change sleeping position?

Maybe you don't want to make friends with a person who sleeps curled up. Why?

A. He or she would rather be alone than communicate with you.?

B. He or she is rarely ready to help you.?

C. He or she prefers staying at home to going out.?

D. He or she wouldn't like to get help from you.?

It appears that the writer tends to think highly of the person who sleeps on one side because _______.?

A. he or she always shows sympathy for people?

B. he or she is confident, but not stubborn?

C. he or she has more strengths than weakness?

D. he or she often considers annoying people??

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.”?

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

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

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

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

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