夏冰患了夜盲症，黄昏后就看不清东西，这主要是缺乏（ ） A．维生素D B．维生素

阅读理解。

     Since the 1970s, scientists have been searching for ways to link the brain with computers.

Brain-computer interface (界面) (BCI) technology could help people with disabilities send

commands to machines.

     Recently, two researchers, Jose Milan and Michele Tavella from the Federal Polytechnic school

in Lausanne, Switzerland, demonstrated(展示)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.

     Prof. Milan, 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 Center

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

当屏幕分辨率为1024×768，某幅图像的分辨率为800×600时，（）。

A．图像只占屏幕的一部分

B．屏幕上显示该幅图像的66%左右

C．图像正好占满屏幕

D．屏幕上显示该幅图像的83%左右

建立在日常交往基础上的、由主体与主体之间所结成的丰富而生动的日常生活构成的世界，称为( )

A．科学世界

B．儿童世界

C．生活世界

D．成人世界

由不同功能的计划构成的进度计划系统不包括（）。

A．控制性进度计划

B．指导性进度计划

C．实施性进度计划

D．规划性进度计划

卫生服务研究主要内容包括医疗卫生服务的（）、（）和（）等方面的内容。