Searching for one man in this big city is like looking for a (针) ina big sea. 题目和参考答案——青夏教育精英家教网—

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9. Searching for one man in this big city is like looking for a (针) in

a big sea.

9. needle

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68所名校图书小升初高分夺冠真卷系列答案

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2. Education in government college is very cheap,but if you go to the

college,it is much more expensive.

Sitting too much is now listed with smoking and junk food as a bad habit that increases your risk of heart disease.

New Australian research shows that half an hour in the gym will not make up for the waist-expanding damage caused by spending the rest of the day sitting.

But the good news is that doing chores(家务) in the house or gently walking around the office while on the phone might be enough to keep you fit.

The study joins the growing body of evidence suggesting too much sitting might undo the benefits of exercise.

The study measured the intensity(强度) of physical activities in 168 subjects over seven days. It found that,regardless of how much exercise they did or their total sitting time,those who took more breaks from sitting had lower risk of thick waists and lower level of blood lipids(类脂) .

“Higher levels of blood lipids have been linked to a heightened risk of heart disease，” principal researcher Genevieve Healy of the University of Queenland said. “What the study shows is that there are benefits in just getting up regularly and interrupting your sitting time. ”

Researchers behind the Stand Up Australia project have written to the Rudd Government requesting $ 3. 5 million for a two-year study into the impact of long sitting time on health and productivity of workers. The study would also develop and test strategies for reducing sitting time on the job.

The latest study builds on work that is shifting the health promotion focus from purposeful exercise,such as running,to lower intensity activities throughout the day.

The Australian research has been backed up by American studies. “To hold a body that weighs 77 kilograms upright takes a fair amount of energy from muscles，” said Professor Marc Hamilton from the University of Missouri. “There is a large amount of energy associated with standing every day that cannot easily be replaced by 30 to 60 minutes in the gym. ”

1. The study shows that .

A. exercising for half an hour in the gym is important after sitting too long

B. sitting too long causes the waist to expand

C. walking is the best physical activity

D. having breaks from sitting is good for health

2. The purpose of the last paragraph is to .

A. provide a scientific basis for the benefits of standing up

B. compare the effect of standing with exercising in the gym

C. report the new research findings of Professor Marc Hamilton

D. figure out the amount of energy associated with standing

3. The health development focus used to be on .

A. purposeful exercise

B. running

C. lower intensity activities

D. long sitting

4. What’s the best title for the text?

A. Exercise in the gym is out

B. Your office chair is killing you

C. A cause of heart disease

D. Good news for workers

4. Don’t get out!It (rain) .

4. The old soldier was a heavy smoker,so he used all he had to buy a pack of

c .

4. The thieves (闯入) the office and stole some money.

1. Chinese eat more than twice many vegetables per person today as they did in 2000.

Since the 1970s，scientists have been searching for ways to link the brain with computers. Brain-Computer Interface(BCI) technology could help people with disabilities send commands to machines.

Recently,two researchers，Jose Millan and Michele Tavella from the Federal Polytechnic School in Lausanne,Switzerland，demonstrated(展tjO a small robotic wheelchair directed by a person’s thoughts.

In the laboratory，Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.

“Our brain has billions of nerve cells. These send signals through the spinal cord(脊髓) to the muscles to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles，” Tavella says. “Our system allows disabled people to communicate with external world and also to control devices. ”

The researchers designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.

Professor Millan,the team leader,says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. “The practical possibilities that BCI technology offers to disabled people can be grouped in two categories ： communication and controlling devices. One example is this wheelchair. ”

He says his team has set two goals. One is testing with real patients,so as to prove that this is a technology they can benefit from. And the other is to guarantee that they can use the technology over long periods of time.

1. BCI is a technology that can .

A. help to update computer systems

B. link the human brain with computers

C. help the disabled to recover

D. control a person’s thoughts

2. How did Tavella operate the wheelchair in the laboratory?

A. By controlling his muscles.

B. By talking to the machine.

C. By moving his hand.

D. By using his mind.

3. Which of the following shows the path of the signals described in Paragraph 5?

A. scalp—?computer—cap—wheelchair

B. computer—cap—scalp—wheelchair

C. scalp—cap—?computer—wheelchair

D. cap—?computer—scalp—wheelchair

4. The team will test with real patients to .

A. make profits from them

B. prove the technology useful to them

C. make them live longer

D. learn about their physical condition

5. Which of the following would be the best title for the text?

A. Switzerland,the BCI research centre

B. New findings about how the human brain works

C. BCI could mean more freedom for the disabled

D. Robotic vehicles could help to cure brain injuries

2.今年秋天约翰可能在伦敦。

John be in London this autumn.

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