72.   The purpose of the experiment described in the passage is to find whether

A. blind children can regain their sight

B. blind people have a better sense of sound

C. the sense of touch is better among blind people

D. blood flow in the brains of blind people is slower

73. The participants of the experiment were asked ___.

A. to tell the difference between 16 sounds

B. to take down the time each sound lasted

C. to identify the direction the sound came from

D. to detect the number of the loudspeakers.

74. During the experiment, blood flow in the brains of the participants was measured in order to ___.

A. learn about the way they react to echoes

B. look for the way of enhancing hearing ability

C. find which parts of the brain were functioning

D. expose the relationship between seeing and touching

75. Which of the following statements best summarizes the main idea of the passage?

A. Most blind people have a well - developed sense of touch.

B. People go blind because of the breakdown of their visual cortex.

C. Most blind people have a better sense of sound than normal people.

D. Human brains can adjust themselves after the loss of a certain function.

(D)

Indian's snake charmers are to be retrained as wildlife teachers under a plan to prevent their unique skills and knowledge from being lost. The charmers, who make snakes dance to the sound of flutes(笛子), used to be a traditional feature of Indian life, performing in towns and villages, until they were banned in 1972 to control the trade in snake skins.

The government is now considering a plan to train the saperas, as they are known, to visit schools and zoos to tell children about forests and wildlife. There is also a proposal to set up a “dial a snake charmer” service to help householders to deal with unwelcome intruders.