Research on the human brain has been attracting the attention of more and more scientists in recent years, just like the booming hi-tech industry. One of the latest research topics is how to change the human brain or combine the computer and the human brain, i．e．, to transplant a chip into human brain．This idea may make everyone's dream come true．If we compare a human brain to a hard disc, what the scientists are doing is to enlarge the capacity of the hard disc．For the time being, there are some difficulties in such transplant experiments, but scientists never give up．

       Experiments were started on animals．In 1996, a transplant experiment performed at the Defense and Military Physiology Research Institute in the U．S．turned a bear into a dolphin．

       The dolphin was named Ted, and the bear was named Tallin．Using the most advanced technology, deep and detailed studies were made of the swimming action memory area in Ted's brain by the scientists．They got a lot of useful information．The information was saved into a button-sized chip, which was then transplanted into the action memory area in Tallin's brain．The information saved on the chip was released by means of electric power．

       Recently, another memory transplant was performed at the Motor Nerve Research Institute of the University of California．The comprehensive memory transplanted in the experiment included actions, moods, logic, words, images, etc. The experiment involved an entire transplant of the memory area. This was the largest such experiment done so far.

       The transplant was performed from a dog named “Genius” to a dog named “Idiot”．“Genius” could understand and follow up to 100 gestures and orders made by its master．It was a real genius．“Idiot” was the younger brother of “Genius”．It had no contact with people at all since its birth．It became an animal with nothing in its brain, without any memory．

       The operation was a complete success．When the two dogs woke up, “Idiot” had grasped all the abilities “Genius” possessed; it was good at memorizing and sensible. It could follow every gesture and any command given by its master．But “Genius” gave no response to its master, and in fact did not recognize him at all．

47．The purpose of the experiment is____.

       A．to combine the computer and the human brain

       B．to make bear swim

       C．to make some stupid dog turn clever

       D．to enlarge the capacity of human brain

48．Which of the following statements is TRUE?

       A．The scientists transferred a button-sized chip which useful information in Tallin’s brain.

       B．The first comprehensive memory transplant was performed at the Motor Nerve Research University.

       C．The second experiment wasn’t an entire transplant of the memory area.

       D．The Idiot was an animal with memory before brain experiment

49．What does the underlined word “success” refer to?

       A．The two dogs woke up.

       B．They were both good at memorizing.

       C．The Idiot grasped all the abilities of Genius.

       D．The Genius grasped all the abilities of Idiot.

50．According to the text, we can infer          .

       A．a(chǎn) person can know more after the experiment.

       B．a(chǎn) bear can swim after being transferred a chip with related useful information

       C．a(chǎn) dog can become clever after entire transplant of the memory area

       D．it is really good for animals to have been involved in the transplant experiment

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