揙ur brain has billions of nerve cells. These send siegnals through the spinal cord (脊髓)to the muscles to give us the ，” Tavella says.

　　“Our system allows disabled people to communicate with external world and also to control devices.”(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.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.

　　21．BCI is a technology that can ________．help to update computer systems

　　B．link the human brain with computers

　　C．help the disabled to recover

　　D．control a person's thoughts

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

　　A．By controlling his muscles.

　　B．By talking to the machine.

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