阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词。

　 Attention deficit（不足）hyperactivity（活动过度）disorder is known by the letters A．D．H D．Children with A．D．H．D．might have trouble paying attention．They might not seem to listen and might forget things．They might not be able to stay seated or play quietly．They might talk too much and act and speak without thinking about the results of their behavior．These are among the signs named on the web site of America’s Centers for Disease Control and Prevention．

Doctors usually identify the disorder in children．But experts say the behaviors often last into adulthood．Researchers have been looking for the cause or causes of attention deficit hyperactivity disorder．Now, a brain-imaging study offers more evidence that could lead to new ways to treat it．Researchers say they observed shortages in the brain's reward system in patients with A．D．H．D．The study found that levels of some proteins were lower than normal．Nora Volkow, director of the National Institute on Drug Abuse, says the lack of attention and self –control that mark A.B.H.D. could be caused by problem in the flow of dopamine（多巴胺）. She says people might have difficulty completing an activity if they cannot expect some kind of reward in return. Researchers studied the pathways on which dopamine travels and A.D.H.D. Doctor Volkow says the researchers then compared the pathways to those of 44 adults without the disorder. “There was a lower concentration of dopamine markers in the brain of individuals with A.D.H.D., specifically in the areas of the brain that are involved with reward and motivation. And the dopamine levels were directly linked to the severity, of the patient’s inattention she says.”

The study used brain images taken at Brookhaven National Laboratory in new York State. Gene-Jack Wang is chairman of the Brookdhaven medical department. He says the finding might also help explain why people with A.D.H.D.

 

are more likely to abuse drugs or overeat. He says they might be attempting to increase their dopamine levels to make up for the deficits in their reward system.

Title	●The finding of (1)
The (2)　　 of Children with A.D.H.D.	●They are lacking in (3)　　 . ●Perhaps they don’t seem to listen. ●Perhaps they are(4)　 . ●Perhaps they can’t sit for (5)　　 or play quietly. ●They might talk too much and act and speak without(6)　　　 the results of their behavior
The (7)　　　 of A.D.H.D.	●patients with A.D.H.D are (8)　 of the brain’s reward. ●Levels of some proteins are lower than normal. ●Levels of dopamine are(9)　　 as well.
Reasons of abusing Drugs	●They are trying to (10)　　 their dopamine.

 

More and mor people want to work these days. w.w.w.k.s.5.u.c.o.m　

　　　　 , it has become harder and harder in today’s world to 1.　　　

find work for everybody. The　　　　 （经济）of the world need 2.　　　

to grow　　　　 4% each year to keep the old number of jobs for people.　 3.　　　

Often this is impossible, so more and more people are out of w 4.　　　

On the other h　　　 , new machines can do the work of many people 5.　　　

in a short time. What’s　　　　　 , machines do not ask for more money 6.　　　

and longer holiday. All over the world, machines are t　　　　　 the place 7.　　　

of people little by little, not only in cities but also in the　 　　　（乡村）. 8.　　　

Thousands of people are　　　　 （搬家）to cities every day and 9.　　　

l　　　　 for jobs, but how many of them can find one?　 10.　　　

k.s.5.u.c.o.m

 

Many objects that people use each day started with a simple idea．These objects have often changed the way we 　1 . Some help us to do a job more 　2 . Others fill a need or solve a problem.

In 1858 H.L. Lipman had such an 　3 . He 　4　 out a pencil, a piece of paper, and an eraser. Then he began to write. Sometimes he needed to 　5 a word. Each time he had to search under his books and papers to 　6 the eraser. “I wish my eraser would stay in one 　7 !” he said.

Then Lipman had his simple idea .He 　8 a groove in one end of the pencil .He glued the eraser into this groove. Lipman had solved his problem .Later he thought that others might like to have such a pencil. So he sold his 　9 . Soon pencils with erasers were 　10 . His design earned him $100,000.

1．A．study　　　　 B．live　　　　 C．sleep　　　　 D．walk

2．A．easily　　　　 B．correctly　　　　 C．carefully　　　　 D．normally

3．A．article　　　 B．aim　　　　　 C．idea　　　　　　 D．action

4．A．got　　　　　 B．took　　　　　　 C．brought　 　 D．put

5．A．spell　　　　 B．read　　　　　　 C．write　　　　 D．change

6．A．look　　　 B．see　　 　 　 C．watch　　 D．find

7．A．place　　　 B．desk　　　　　 C．book　 　 　 D．hand

8．A．marked　　　　 B．prepared　　　　 C．cut　　　　　 D．invented

9．A．books　　　　 B．pencil　　　　 C．design　　　　 D．eraser

10．A．wonderful B．expensive　　　 C．colorful　　　　 D．common

 

阅读理解。

　　In the near future some parts of the world may soon have a new kind of television. It is called high definition television or H-D-T-V. The main difference between H-D-T-V and normal television is the picture. It is more clear and detailed (明细). This is because H-D-T-V has many more points and lines that make a television image (图像). Every colour television picture contains thousands of red, green and blue points, They all come together as an image in the eye of the person

watching. The points are organized in lines that go across the television screen. There are more than 500 lines in a normal television. H-D-T-V has two times as many. To get this clear picture, you must have a big screen. Experts say people using a small screen will see little difference.

　　H-D-T-V also has clear sound. It is like the sound on a compact disc player (激光电唱机), or CD. All these improvements make H-D-T-V very costly. One kind in Japan now sells for more than 20 000 dollars. In the future, the cost is expected to be about 2 000 dollars. A major problem with H-D-T-V is its broadcast signal. The signal is bigger than for normal, because it carries more electronic in formation.

1．The main difference between an H-D-T-V and a normal television is ________.

[　　]

A．that the picture of normal TV is normal

B．that H-D-T-V is new and good

C．that H-D-T-V is so new that not all parts of the world have got it at present

D．that the picture of an H-D-T-V is more clear and detailed

2．A colour TV image is ________.

[　　]

A．made up of thousands of red, green and blue points

B．formed by the above-mentioned red, green and blue points which are organized in lines that go across the TV screen

C．a black-and-white picture

D．both A and B

3．An H-D-T-V has ________ lines.

[　　]

4．If you want to get a clear and detailed picture from an H-D-T-V, you ________.

[　　]

A．must have the bigger signal for H-D-T-V

B．have to get a big screen

C．should have a compact disc player

D．both A and B

5．According to the passage, which of the following is right?

[　　]

A．The H-D-T-V sets are not popular now because they are too expensive for most people.

B．The signal for an H-D-T-V is not bigger than that for the normal TV.

C．In the future an H-D-T-V will cost 10 times as much as it costs now.

D．In the future an H-D-T-V will be cheaper only because 2 000 dollars will be just equal to 20 000 dollars.