Those who squeezed with their right hand，followed by their left，remembered the most words．

　　The next best were the volunteers who made a fist with their right hand both times，while those who didn’t squeeze at all did better than those who led with their left．

　　It is thought that the movement of clenching the right fist activates a brain region that is involved in storing memories，while squeezing the left hand awakens an area that is key to getting back information．

　　Lead researcher Dr Ruth Propper said：‘The findings suggest that simple body movements—by temporarily changing the way the brain functions—Call improve memory．’

　　46．What’s the writer’s purpose to write the passage?

　　A．To make known the result of the experiment．

　　B．To tell people memory depends mostly on their hands．

　　C．To show the function of body’movements in memory．

　　D．To state that good memory benefils from labor．

　　47．If you want to recall something in your memory，you should clench________________．

　　A．your fight hand

　　B．your left hand

　　C．both of your hands

　　D．your left hand first，and then right

　　48．The underlined word“trick”in the fourth paragraph is the closest in meaning to“_________________”．

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