An old man and his wife walked slowly into McDonald's　 28　 a cold winter evening. They took a table near the back wall, and then the old man walked to the cash register (收银处) to order. After a while he got the food back and they began to　 29　 it.

　　 There was one hamburger, some French fries and one drink. The old man carefully cut the hamburger into halves and　 30　 the French fries into two piles. Then he neatly put the 31　 of the food in front of his wife. He took a sip of the drink and his wife took a sip. They took 　 32　 to drink. "What a 　33 family!" The people around them thought. A young man came over and offered to buy　 34　 meal for them. But they said "No" 35　 and told the young man that they got used to　 36 everything.

　 　 37 the man began to eat his hamburger and his French fries, his wife sat there watching him, Then a young lady asked the old lady a question. "Madam, why aren't you eating? You said that you shared everything. Then what are you waiting for?" She answered, "The teeth."

28. A. for　　　　 B. on　　　　　 C. in　　　　　 D. at

29. A. eat　　　 　B. taste　　　　 C. open　　　　 D. try

30. A. grouped　　 B. placed　　　 C. changed　　　 D. cut

31. A. half　　　　 B. bit　　　　　 C. piece　　　　 D. pair

32. A. break　　　 B. care　　　　　 C. turns　　　　 D. times

33. A. amazing　　 B. wise　　　　 C. hopeless　　　 D. poor

34. A. another　　 B. the other　　　 C. other　　　　 D. an other

35. A. happily　　 B. carefully　　　 C. politely　　　 D. angrily

36. A. share　　　 B. sharing　　　 C. enjoy　　　　 D. enjoying

37. A. Because　 　 B. As　　　　　 C. So　　　　　 D. Before

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

41. 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

42. 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.

43. 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

44. 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

45. 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

Scientist Without Laboratories
When you hear the word “scitentist”, what do you think of? Many people think scientist are people in clean white coats who work in labs. And some scientists do work in labs. But there are   26  scientist who work in woods and jungles. These scientists are called “animal behavior (行为) scientists”, and they study animals as they live in nature.
Why don’t these scientists catch animals and study them in zoos? The   27  is in the word “behavior”. Animals behavior scientists want to learn   28  animal behave in their wild homes. When animals live in cages (笼子) or in zoos, they do not act the same as they do when they are   29 . They may fight   30  each other, or they may not eat, or they may not raise (抚养) their babies as they usually would. To see real animal behavior, scitentists must go where the animals   31 .
So animal behavior scientists go into the jungles, the woods or the desert. There , their most important   32  are their eyes and ears. They watch and listen to the animals very   33 . They write down everything that happened in notebook.   34 
they live near the animals, the scientists are careful not to frighten them. If the scientists are luncky, the animals will   35  no attention to them. Then the scientists can see how the animals really live.
The behavior scientists hope what they’ve learned about animal behavoir can provide clues (提供线索) to help people learn to live together more happily.