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高三阅读理解Remember those slow snails you often see

时间:2019-03-14 19:31  作者:Edmond  来源:www.2abc8.com

Remember those slow snails you often see on the ground after a rainy day? Well, these animals have made headlines recently with an astonishing discovery by UCLA researchers who were able to transfer(转移)memories from one snail to another!

    They experimented with sea snails because they have impressive memory habits and large neurons (神经元) which make them easier to work with. Dr. David Glanzman, who led the experiment, believes that RNA located in our brain cells is responsible for long-term memory. This went against the well-established belief that long-term memory was stored in the brain’s neuron synapses (突触).

For the experiment, scientists trained certain snails to develop a defensive reaction by contracting (收缩) whenever they were pushed. Originally, the action would last for a few seconds, but by consistently shocking the snails,their contracting period grew to last a lot longer, up to 50 seconds. Then,they took RNA from brain cells of the trained snails and put them in untrained cells. When these new cells were put back into the untrained snails,these sea snails started exhibiting immediate behaviors that were as if they had been trained to develop long defensive reactions!

This was shocking as these memories were extremely specific. This showed that RNA transfer might influence our memory by, finishing a memory transfer. David Glanzman believes once we get a deeper insight on how memory functions,it can help us better understand illnesses that are deeply affected by our memories and how we react to past experiences.

However,Glanzman's experiment is still highly controversial as many believe that the human brain is much more complex than those of the snails and that we may not find similar associations such as memory transfer. There, is still much to discover about how our brains function and Glanzman’ s experiment just proves the mystical and interesting possibilities of the brain.

32. Why did the researchers choose sea snails to experiment with?

A. Their memories are stored in neuron synapses.

B. Their RNA is responsible for long-term memory.

C. Their memory is stronger than that of other animals.

D. Their characteristics are suitable for the experiment.

33. Which shows the correct order of the experiment stages?

①Put RNA into untrained brain cells.

②Untrained snails seem to have been trained.

③Trained snails show longer defensive period.

④Take RNA from the brain cells of trained snails.

⑤Certain snails are consistently pushed.
⑥Put cells with trained RNA into untrained snails.

A. ②⑤③④⑥① B. ②①⑤④⑥③ C.⑤④①③⑥② D.⑤③④①⑥②

34. In what field does David Glanzman think his experiment might be useful?

A. Understanding past experiences. B. Strengthening children’s memory.

C. Learning about memory-related diseases. D. Improving other animals’ memory habits.

35. Many people disapprove of the conclusion of the experiment because_.

A. the human brain is much more complex

B. some memories can never be transferred

C. human memory has much more information

D. the human brain shouldn’t be used in such experiments


答案 32. D 33. D 34. C 35. A

 

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